: They look identical and so does the sport supension brackets on the strut towers. A lot of tech from the 90's and one hot car to drive.
shafts may be stronger. I know that many of the really high hp Z's in Japan use either the Skyline GTR diff 4.1 or the Q45 diff also 4.1 I believe. The GTR uses thicker half shafts and to use that diff on a Z you have to switch to the GTR shafts or get HKS ones. I believe the Q45 may have thicker shafts as well. The new Q45 may not have the same rear as the prior Q45's.