90hp force lower unit swap

[A.Hoj]

My lower unit has been making some strange noises at idle speed, but goes away once I thottle up. If I can find one cheap enough I'd like to just swap it out before I get stranded 5 miles out in the ocean.

Can someone tell me which lower units from other sizes/years force motors will fit my 1998 90hp force (serial # OE326317)?

More specifically will a 1999 75hp force lower unit fit?