twocats I think most people would say that playing the music to memorize it would involve muscle memory, aural memory, and visual memory but different people would use different amounts of those three.
I think in addition also memorizing "in this section it starts with B-flat on the lower note". I don't know what to call that, informational memory?
I don't think many people are concerned with memorizing notes that begin some section as opposed to any other notes. They might be concerned with memorizing certain specific notes that are tricky for some reason or notes in passages that are almost like other passages but different in some detail. For example, in the Chopin Waltz in C sharp minor B section The same passage repeats twice but with very slight differences in the notes so one might be forced to memorize those differences . I don't think there's any special name for memorizing specific notes, and I've never even seen that idea mentioned in articles about memorization or books where a pianist discusses their personalmemorization techniques.