What about things like kegels/squeezing?
Mouths are probably pretty different right? More tongue movement, unless you are facefucking.
If you’ve ever participated in something like a train - can you feel the difference between a vagina that has already been fucked?
Only speaking from personal experience obviously. Ass and vagina - yes, vastly different. Vagina is like a really wet warm tunnel with pretty even pressure throughout. Ass has a really tight opening and then less so further in. As for kegels, oh boy yes can you feel the pressure differences. Like squeezing a fist.