Is 30a a bigger bra cup size than 32a?

The answer is yes.

The bra cup size is determined by the difference between the bust measurement and the underbust measurement. The larger the difference, the larger the cup size. In this case, the difference for 30a is 2 inches (32-30), and the difference for 32a is 1 inch (33-32). Therefore, 30a is a bigger bra cup size than 32a.