ok , the rear housing that bolts to the subframe is different between ceff(r32) and r33 but it's just a simple un-bolt then bolt the one off your diff that your currently using , with r33 they had big rubber bushes(and plates) in the front holes of the diff so you need all of that to bolt in and that's it
NOTE: axle stubs , r33 are 5 hole and cefiro are 6 hole (3x2) , i'm pretty sure you can interchange them between diffs (not 100% sure so it might pay to read up somewhere) , but r32 r33 axles all fit if it's not already changed