Jake, the difference between a Mac 10 and a MAG58 or an M16 and an AK is in no way equal to the different between an older HK and a newer designed HK that has the same trigger guts from the factory.
The HK-94/SL8 difference is more like the Sten/Sterling difference.
An an unmodified M16 sear will not work in an unmodified AK action. An unmodified Mac 10 sear will not work in an unmodified Mag58 action. But, an unmodified HK sear will work in an unmodified new HK (SL8) without any cutting or welding or drilling.