Personally, I think, first of all, the action of cooking is different. The action of "rinse" is to quickly put meat or vegetables in the pot and heat them for eating (so there should be very few things cooking in the pot at the same time); The hot pot is a big pot to cook (you will see a lot of things cooked in the pot at the same time).
Secondly, the meat slices in the shabu-shabu are very thin, because this can quickly burn cooked food; Hot pot is not.
It makes it possible to put different things together in the pot (such as chicken, ribs, sauerkraut, seafood, etc.), which are not easy to cook immediately. However, hot pot can be eaten as a shabu-shabu, but shabu-shabu can't be turned into hot pot.