I can't say with any certainly on your Merc but I know with Yamaha they do what you're talking about. But it may not be quite as simple as you think.
For instance, the only difference between the 3 cylinder 40hp 2 stroke and the 50hp big brother is the carb jet and the exhaust tuner. There's your extra 10hp. They do the same thing in the 25/30, the 60/70 and the old 75/85/90. I know Merc does it on the 40/50/60 59ci block as well as well as the 20/25 2 cyl. I'm confident Merc does it on others as well.
The best way to compare is go to Mercury's site and find the part breakdown for both motors. Go to the carb and compare the part numbers. The body of the carb is likely the same, but just the main jet is different. Most carbs have 2 jets, one that feeds fuel into the motor when it's at idle, and the other when it's basically anywhere past idle speed.
Then for reassurance, check out the exhaust tuner that comes out of the mid section to see if those parts are the same. If not, then you'll have more than just carb jets to change to get those extra few hp out of her.
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Last edited by willyworm; 04-15-2018 at 06:39 PM.
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Delta in a nutshell: Breeding grounds + small wetlands + big blocks of grass cover + predator removal + nesting structures + enough money to do the job= plenty of ducks to keep everyone smiling!
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