injectors are different, easy to swap, as are most other sensors as the plugs are different. Whoremonger balancer is probably one piece on the later one and two on the earlier one, no issue there as the one piece can just be left and will work fine in place of the 2 piece. 02 and later 46re trans has a different neutral safety switch mount and no easy way to swap them with the 01 and earlier ones.