Ok ... forget the prop just thrashing the air at 2550 rpm. Think of the prop as you should ... an airscrew!
Now, you have to know if both engines are capable of attaining 2550 rpm at a standstill? if they both can, then the prop is way to small for either engine ( either in diameter or pitch) and especially for the bigger engine. If that's the case then the engine will be over revved and it's full power will never be utilised. Max rpm ( assume max rpm for TO) should never be otainable at a standstill ... if it is .... the prop is to small. So in this case having the bigger engine is a waste anyway unless a different prop (airscrew) is fitted. SO if, as it should be, the aircraft needs to move forwards to allow the prop to screw through the air efficiently enough to use the full power available ... the more powerful engine will get there first.
And I'm assuming the same pilot is flying .... because you most certainly can slow an aircraft's ability to get airbourne by pulling the nose up too soon and thus causing drag! ... get off the ground that way and you're straight to the back of the drag curve!!! .... been there, so I know ( same aircraft, same power, same rpm, but completely different performance )
IM