LS9 has a stronger crank to handle the ZR1 HP/Tq so it's flyhweel has nine bolts to 6 bolts for other models.

LS9 also has a new designed slave that now allows just the bearing be replaced if need be where older design you had to replace the whole slave.

ZR1 also has a larger diameter driveshaft and drivetube.
The end of driveshaft though going through clutch and pilot bearing is the same for all models.