Like Hal said there's a lot of vairiance between 22 shells and there'll be some vairiance in the 25 too. European 25 acp is in most cases loaded hotter than domestic.
My 22lr Bobcat is shooting velociters is quite louder than my Vest Pocket Colt 25 shooting WWB but shoot Sellier and Belliot 25s vs CCI std velocity and the 25 is a little louder.
None of them are very quiet though
