Early RRC had one shock behind the axle, fillers plugs in the diffs (which had imperial bearings) and single peice 10 spline halfshafts.
EFi onwards axles had 2 shocks ahead of the axle, metric diffs with no filler plug but retained the halfshafts
ABS axles then had 2 piece halfshafts secured IIRC with metric bolts, different stub axles for the ABS sensor and sensor rings bolted inside the disks
300 TDi were then 24 spline with single piece halfshafts (but flatter heads) and a rubber flex joint on the propshaft.
200 TDi Defenders had drum brakes, 2 piece shafts and 10 spline metric diffs. The centre of the hub sticks out too far for a RRC alloy wheel to fit successfully because the bearings are further apart in the hub and the driveshaft/drive member stick out further.
300 TDi Defnder would be 24 spline but by then able to fit an alloy wheel, so I'm not sure how distinct they are.
All later axles had ARB mounts