hello,

you can appear in both the counselling that is mht cet counselling and in cap round but you need to apply separately. If you want to appear in cap round then you have to register yourself through your jee mains paper. If you want to appear in mht cet counseling then you need to register yourself through mht cet rank card. But you can not apply in cap round from both the domains at the same time.

all the best!!