im on the third motor in my cbr. 1st one had piston/crank failure, 2nd had gearbox failure. third one is ok....

question....
can i put the gearbox from my SC21 into the SC24 motor and make one good one out of the two?
honda being honda, there seem to be a myriad of little differences between the two models.....
anyone done this, or know?
thanks.