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Timing and fuel maps, and rev limiter. Other than that, they both use the same ecu harness plugs, and both are pretty much worthless as far as chipping goes, unless you feel like learning electronics theory.
PM7 apparently has a 7800 fuelcut, DOHC ZC, but I've never seen/experienced that in person, and stock clusters suck *** for accuracy so take it for what it's worth.