It can be a load of hassle, as Allan says really you need the inner and outer covers
then you need the timing idler pinion, then the kickstart quadrant and gearbox one and on and on........
Plus you'll need BSF screws/allen bolts of different lengths on a few.
If you have a pile of stuff laying around you can ferret through to achieve the job,
yes , but if you don't , stick to the early setup and avoid the stress.
The early setup is ok anyway, just make sure the adjustment is correct.
Plus as Allan said, the clutch is a better unit.