i was wondering if the quarter panels are the same thinkness of metal as the floors soo 22 gauge?

cars generally use 16,18, and 20,  i would not go any thinner than 20.

22 is a pain to work with, just too thin

Aren't floors generally 18 and older car panels 20?

thanks i have a few sheets of 20 guage and 18 guage sheet metal