I've recently picked up two tohatsu outboard motors. One is an m25c2. And the other is an m18c2.I got 25 with the lower unit removed and disasembled (no parts in lower unit). I'm curious to know is it possible that the parts inside the 18hp lower unit, fit inside the 25hp lower unit? I'd prefer to know if it's plausable before I end up tearing it down for no reason. thanks in advance