How should models be handled?

[sevosevo]

I am creating this project in Typescript.
I saw there are multiple models for the same entity (Product). For example:
-ProductComplete
-ProductDetail
...
Should these models be strictly separate entities (like classes or whatever) or is this
just how the JSON response should look like?
For example, in Sequelize I have a Product model, but that's Sequelize's model. Does it have to do anything with these models?
My question is basically, are these given models just data structures I should follow in terms of JSON response or they should be a separate entity?
I sent the image of my Product model as an example of how my model looks like.
Do I need separate ProductComplete and ProductDetails models?
Now I know this might be a stupid question, obviously, it depends on the design but what's recommended?

I hope you guys understand my question.
Thanks