Hello dear student, 

There is no caste-based reservations are given in the mop-up rounds. The mop-up rounds are basically done to fill all the vacant seats in the colleges so it is only based on the common rank list marks without the caste-based reservation so that the seats can get filled faster. All seats are filled under open category based on the rank seats are filled . I hope you understand this. It's not only for the Rajasthan but all over india mop up rounds are done like this only 

Best wishes