Well considering the block and head is completely shit, yes.
There is a 26% increase in the respective factory rated Brake torque, I have no idea what that is in repect to Wheel torque, however I would assume that drivetrain loss would be similar. Apples to apples, applesauce to applesauce.
You said there is no advantage because of the weight increase, the curb weight of a GSX is around 2900 lbs, a 26% increase is ~750 lbs.
I know this much logic must hurt your head, as much as the logic of buying a brand new car only to void the warranty.