gearbox change

Would anyone know if I get a 1.2 k12 gearbox will it go straight on a k12 1.0?
They are identical,pretty sure even the dci is the same. Not 100% on the dci though. The only difference in the 1.0,1.2 and 1.4 engines are the bore and stroke. Other than that,all parts are identical.
 
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