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Upgrading Yamaha 40/28 Jet Drive to 50 HP

From what I looked up on the part numbers for the carburetors and jets they are the same parts numbers for both 40 HP and 50 HP models. Not sure about the exhaust part #'s So I'm guessing it may be just returning the carburetors to get it up to 50 HP??
 
From what I looked up on the part numbers for the carburetors and jets they are the same parts numbers for both 40 HP and 50 HP models. Not sure about the exhaust part #'s So I'm guessing it may be just returning the carburetors to get it up to 50 HP??

The part numbers for the pistons and crank assembly are also the same between the 40 HP and 50 HP models.
 
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