Paints are stock horses like the QH, they are a breed not a colour as are appys, QH folks often simplify it that paints are QH with too much colour to be registered (old rules were any colour above the knee/hock or not on face prevented registration) but paint folks get very upset at that. Appys are quite different with different conformational traits and the markings are different too, spotted rather than splashes or floods of colour.
I believe the tobiano or sabino are universal talking about a specific genetic thingy that effects colour, its just paint breeders are more concerned with these as solid paints are undesirable, paints are specifically bred for colour generally so reference to these specifics are more common.
Jess's mum is paint x tb and dad is QH but she can only be reg as solid part bred paint which excludes her from some comps etc, if she had colour it would be different.