I would answer ‘no’. At least, ‘no, not in the same way.’
A denomination asserts their independence from other groups and their ‘right’ to define their own dogma. By creating a new denomination, they’re asserting that they are not part of some other group and are their own entity, with their own hierarchy (or at least, their own adminstration), beholden and answering to no one else.
Liberal parishes, liberal orders, $$PX, cafeteria Catholics, dissenting Catholics, dissenting clergy?
Are there differences within various groups of Catholics? Absolutely. (After all, we’re just people. Where there are two people, there are already differences in opinion. Just ask any married couple. ;))
But, whereas there are differences of opinion, there is nonetheless unity under a common leadership, a common hierarchy, and a common set of doctrine (even if some claim that they don’t agree with it).
There’s your difference, and it’s huge: 30000 denominations are 30000 distinct entities; there is only one Catholic Church and one Eucharist and one Vicar of Christ.
Also, the heresies that have splintered off over time? How about the Great Schism?
Well, they’re no longer Catholic, right? So… in a way, they’re kind of in the same boat as the “30000 denominations”, right? :shrug: