My guess is no - not the same lower unit. But its just a guess. Seems to me I remember reading somewhere - that OMC lower units were different from the 150/175 to the 225. Ya gotta figure the 225 lower unit to be much beefier to handle the extra power.
oh and on ratio that is same on those but wouldn't matter you could just prop the motor to work with the ratio you have in the lower unit. i have seen twin V6's with twin V4 lower units using just a higher pitch to fix the ratio.