Welcome.

How long have the 2 been together?
Can you leave one in a playpen (cage) and the other loose, and able to inspect? Then switch them.
The rough stuff is not really bad, unless one is hurting the other.
Does the one who screeched ever go on the offensive, or are they always defensive and not interested in wrestling?

I like to see them evenly matched, even if not in size or age.

I had a 2 mo old that terrorized two 4 mo olds.