1993 seadoo XPEM question

[85vette]

This is an older seadoo, but I have run into difficulties finding the part number and the part for this seadoo for the MPEM unit. As you know this has the 657 engine with twin carbs and tuned exhaust. The year before had the 587 engine with single carb and regular exhaust. The MPEM for the 92 has the same number of wires and colors, so I was thinking swap. The only downside i can see is with igntion timing due to the twin carbs and tuned exhaust to develop the 70 hp. So I thought if the seadoo only gets 60 hp so what it is running. Any thoughts on any of this???