apparently this isnt important enough for sea doo to advertise
usually when there are two motors on a boat they counter rotate to alleviate the torque steer condition that happens when a single screw is putting pressure on your hand on the wheel to turn against the desire of the boat to turn right...
the yamaha and others advertise counter-rotation motors so siince no one has answered...i can only assume this is the reason.
i checked the parts explosions like you did but i am not sure
i have too little cred here to tell you for sure
bobby