FD, most of the aircraft you've mentioned don't have a carb air system, probably because they have fuel injection.
On higher powered a/c the affect is masked due to the percentage power loss being smaller. I've noticed this effect on nearly all a/c I've flown with a CSU, and that's definately more than a couple, it might be very minor, but there is a small initial difference, note I don't say the the RPM drops for any length of time, but like all mechanical systems the CSU bob weights do take a (small) amount of time to react to allow the pitch to fine slightly and therefore regain the specified RPM.