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.
Noticed it captured a megaman legends vibe ....
https://x.com/AgentifySH/status/2001037332770615302
and here it generated a texture map from a 3d character
https://x.com/AgentifySH/status/2001038516067672390/photo/1
however im not sure if these are true uv maps that is accurate as i dont have the 3d models itself
but ive tried this in nano banana when it first came out and it couldn't do it