Welcome to iboats.
Thats a very good question. But I can't give you the answer, sorry.
There were at least 2 different systems used on the 70, and at least 1, or 2 used on the 75. All depends on the year of production.
To further complicate things, there were different stators used some years, and an updated stator offered as the early ones had issues. And the later 75's had CDM ignitions instead of a switchbox.
I'd say, if the parts fit, its worth a try.
May have to swap the flywheel as well, if it fits.
Maybe someone else will be along that has more info for you.