> however im not sure if these are true uv maps

I can tell you with 100% certainty they are not. For example, Crash doesn't have a backside for his torso. You could definitely make a model that uses these as textures, but you'd really have to force it and a lot of it would be stretched or look weird. If you want to go this approach, it would make a lot more sense to make a model, unwrap it, and use the wireframe UV map as input.

Here's the original Crash model: https://models.spriters-resource.com/pc_computer/crashbandic... , its actual texture is nothing like the generated one, because the real one was designed for efficiency.