3 and 5 door rear standard bumpers are different, although I don't think they have changed in their respective designs since they were released.
However, the newer Sline rear bumper on either the 3 or 5 door IS different to the standard ones. They have a smoother line to them and I think do away with the rubbing inserts. Therefore, a swap from an Sline bumper to a standard one (i.e. to old Sline models pre bumper change, Sport, SE or Std) might not work.