I don't know, but suspect the rear wheel gets bolted to the final drive. If that's the case, then I can see why the LC final drive would not work on the AC, because the LC has an outside bearing to support the rear axle and AC, like the People 50 doesn't.
However, I watched some vids and looks like the final drive is the shaft the clutch fits to. If that's the case, I don't know why the Malossi final drive wouldn't fit the Super 9 LC and AC? The People 50 has 16" wheels and would need different gears compared to the 12" wheels on the Super 9, so I can see why the People and Super 9 final drive would be different.
To make matters more confusing, the maintenance manual calls the axle the final shaft and the clutch shaft the drive shaft. However, I am almost sure the drive shaft is what gets replaced and is this shaft, the one the clutch is attached to.