Textures.com says you can sell models with their textures, but will the marketplace allow it?
Normally: No you cannot.
But:
If they are heavily edited for your specific model (used it as a base for quixel/substance/photoshop) so it matches the uv’s of the model you can.
But again, they cannot be used as a seamless texture, and its seperate shader cannot be used on other meshes.
which makes it a very gray area.
Ill forward it to a marketplace buddy just to be sure though.
Personally, I wouldn’t do it, nor risk it.