2011 Merc 90 Optimax 2 stroke vs 115

[purduephigam]

Physically, are these motors the same size? I wasn't sure the differences between the two. I'd imagine if they have the same block, they weigh approximately the same as well? I wasn't sure if the older models were different physically (I understand that a newer Merc 90 4 stroke is the same size as the 115). Thanks everyone.

[EuropeanAM]

Physical dimensions of the output (outside measurements) are the same.

All of the differences are inside the cowling.