diff --git a/pkg/extensions/sync/sync_internal_test.go b/pkg/extensions/sync/sync_internal_test.go
index a36b784ef..2227755fd 100644
--- a/pkg/extensions/sync/sync_internal_test.go
+++ b/pkg/extensions/sync/sync_internal_test.go
@@ -649,3 +649,246 @@ func TestFindRepoMatchingContentID(t *testing.T) {
 		}
 	})
 }
+
+func TestCompareManifest(t *testing.T) {
+	testCases := []struct {
+		manifest1 ispec.Manifest
+		manifest2 ispec.Manifest
+		expected  bool
+	}{
+		{
+			manifest1: ispec.Manifest{
+				Config: ispec.Descriptor{
+					Digest: "digest1",
+				},
+			},
+			manifest2: ispec.Manifest{
+				Config: ispec.Descriptor{
+					Digest: "digest2",
+				},
+			},
+			expected: false,
+		},
+		{
+			manifest1: ispec.Manifest{
+				Config: ispec.Descriptor{
+					Digest: "digest",
+				},
+			},
+			manifest2: ispec.Manifest{
+				Config: ispec.Descriptor{
+					Digest: "digest",
+				},
+			},
+			expected: true,
+		},
+		{
+			manifest1: ispec.Manifest{
+				Layers: []ispec.Descriptor{{
+					Digest: "digest",
+					Size:   1,
+				}},
+			},
+			manifest2: ispec.Manifest{
+				Layers: []ispec.Descriptor{{
+					Digest: "digest",
+					Size:   1,
+				}},
+			},
+			expected: true,
+		},
+		{
+			manifest1: ispec.Manifest{
+				Layers: []ispec.Descriptor{{
+					Digest: "digest1",
+					Size:   1,
+				}},
+			},
+			manifest2: ispec.Manifest{
+				Layers: []ispec.Descriptor{{
+					Digest: "digest2",
+					Size:   2,
+				}},
+			},
+			expected: false,
+		},
+		{
+			manifest1: ispec.Manifest{
+				Layers: []ispec.Descriptor{
+					{
+						Digest: "digest",
+						Size:   1,
+					},
+					{
+						Digest: "digest1",
+						Size:   1,
+					},
+				},
+			},
+			manifest2: ispec.Manifest{
+				Layers: []ispec.Descriptor{{
+					Digest: "digest",
+					Size:   1,
+				}},
+			},
+			expected: false,
+		},
+		{
+			manifest1: ispec.Manifest{
+				Layers: []ispec.Descriptor{
+					{
+						Digest: "digest1",
+						Size:   1,
+					},
+					{
+						Digest: "digest2",
+						Size:   2,
+					},
+				},
+			},
+			manifest2: ispec.Manifest{
+				Layers: []ispec.Descriptor{
+					{
+						Digest: "digest1",
+						Size:   1,
+					},
+					{
+						Digest: "digest2",
+						Size:   2,
+					},
+				},
+			},
+			expected: true,
+		},
+		{
+			manifest1: ispec.Manifest{
+				Layers: []ispec.Descriptor{
+					{
+						Digest: "digest",
+						Size:   1,
+					},
+					{
+						Digest: "digest1",
+						Size:   1,
+					},
+				},
+			},
+			manifest2: ispec.Manifest{
+				Layers: []ispec.Descriptor{
+					{
+						Digest: "digest",
+						Size:   1,
+					},
+					{
+						Digest: "digest2",
+						Size:   2,
+					},
+				},
+			},
+			expected: false,
+		},
+	}
+
+	Convey("Test manifestsEqual()", t, func() {
+		for _, test := range testCases {
+			actualResult := manifestsEqual(test.manifest1, test.manifest2)
+			So(actualResult, ShouldEqual, test.expected)
+		}
+	})
+}
+
+func TestCompareArtifactRefs(t *testing.T) {
+	testCases := []struct {
+		refs1    []artifactspec.Descriptor
+		refs2    []artifactspec.Descriptor
+		expected bool
+	}{
+		{
+			refs1: []artifactspec.Descriptor{
+				{
+					Digest: "digest1",
+				},
+			},
+			refs2: []artifactspec.Descriptor{
+				{
+					Digest: "digest2",
+				},
+			},
+			expected: false,
+		},
+		{
+			refs1: []artifactspec.Descriptor{
+				{
+					Digest: "digest",
+				},
+			},
+			refs2: []artifactspec.Descriptor{
+				{
+					Digest: "digest",
+				},
+			},
+			expected: true,
+		},
+		{
+			refs1: []artifactspec.Descriptor{
+				{
+					Digest: "digest",
+				},
+				{
+					Digest: "digest2",
+				},
+			},
+			refs2: []artifactspec.Descriptor{
+				{
+					Digest: "digest",
+				},
+			},
+			expected: false,
+		},
+		{
+			refs1: []artifactspec.Descriptor{
+				{
+					Digest: "digest1",
+				},
+				{
+					Digest: "digest2",
+				},
+			},
+			refs2: []artifactspec.Descriptor{
+				{
+					Digest: "digest1",
+				},
+				{
+					Digest: "digest2",
+				},
+			},
+			expected: true,
+		},
+		{
+			refs1: []artifactspec.Descriptor{
+				{
+					Digest: "digest",
+				},
+				{
+					Digest: "digest1",
+				},
+			},
+			refs2: []artifactspec.Descriptor{
+				{
+					Digest: "digest1",
+				},
+				{
+					Digest: "digest2",
+				},
+			},
+			expected: false,
+		},
+	}
+
+	Convey("Test manifestsEqual()", t, func() {
+		for _, test := range testCases {
+			actualResult := artifactDescriptorsEqual(test.refs1, test.refs2)
+			So(actualResult, ShouldEqual, test.expected)
+		}
+	})
+}
diff --git a/pkg/extensions/sync/utils.go b/pkg/extensions/sync/utils.go
index 3a9bc672e..22c243ca9 100644
--- a/pkg/extensions/sync/utils.go
+++ b/pkg/extensions/sync/utils.go
@@ -412,9 +412,8 @@ func canSkipImage(repo, tag, digest string, imageStore storage.ImageStore, log l
 func manifestsEqual(manifest1, manifest2 ispec.Manifest) bool {
 	if manifest1.Config.Digest == manifest2.Config.Digest &&
 		manifest1.Config.MediaType == manifest2.Config.MediaType &&
-		manifest1.Config.Size == manifest2.Config.Size &&
-		len(manifest1.Layers) == len(manifest2.Layers) {
-		if descriptorEqual(manifest1.Layers, manifest2.Layers) {
+		manifest1.Config.Size == manifest2.Config.Size {
+		if descriptorsEqual(manifest1.Layers, manifest2.Layers) {
 			return true
 		}
 	}
@@ -423,31 +422,35 @@ func manifestsEqual(manifest1, manifest2 ispec.Manifest) bool {
 }
 
 func artifactDescriptorsEqual(desc1, desc2 []artifactspec.Descriptor) bool {
-	if len(desc1) == len(desc2) {
-		for id, desc := range desc1 {
-			if desc.Digest == desc2[id].Digest &&
-				desc.Size == desc2[id].Size &&
-				desc.MediaType == desc2[id].MediaType &&
-				desc.ArtifactType == desc2[id].ArtifactType {
-				return true
-			}
+	if len(desc1) != len(desc2) {
+		return false
+	}
+
+	for id, desc := range desc1 {
+		if desc.Digest != desc2[id].Digest ||
+			desc.Size != desc2[id].Size ||
+			desc.MediaType != desc2[id].MediaType ||
+			desc.ArtifactType != desc2[id].ArtifactType {
+			return false
 		}
 	}
 
-	return false
+	return true
 }
 
-func descriptorEqual(desc1, desc2 []ispec.Descriptor) bool {
-	if len(desc1) == len(desc2) {
-		for id, desc := range desc1 {
-			if desc.Digest == desc2[id].Digest &&
-				desc.Size == desc2[id].Size &&
-				desc.MediaType == desc2[id].MediaType &&
-				desc.Annotations[static.SignatureAnnotationKey] == desc2[id].Annotations[static.SignatureAnnotationKey] {
-				return true
-			}
+func descriptorsEqual(desc1, desc2 []ispec.Descriptor) bool {
+	if len(desc1) != len(desc2) {
+		return false
+	}
+
+	for id, desc := range desc1 {
+		if desc.Digest != desc2[id].Digest ||
+			desc.Size != desc2[id].Size ||
+			desc.MediaType != desc2[id].MediaType ||
+			desc.Annotations[static.SignatureAnnotationKey] != desc2[id].Annotations[static.SignatureAnnotationKey] {
+			return false
 		}
 	}
 
-	return false
+	return true
 }