Is it the same weight?
Would be funny to buy all the skylines (those that seem alike) and drive 10 laps with each on the same track to see if there's any significant difference.
i did this a while back on suzuka west. il dig the results out quick.
1: Skyline M spec nur
2: Skyline V Spec II nur
3: Skyline V spec II
4: Skyline M spec
5: Skyline LM limited
6: Skyline V spec
7: Skyline V spec R32
8: Skyline GTR N1
9: Skyline N1 R33
10: Skyline GTR
The M spec has slightly more power and beter handling than the other skylines, it is slight but drive them all and it can be felt.