I Thought:
R33 GTR, S2 Stagea & R34 GTT GT4, GTR Coil-Overs are the same 'fitment', from memory R32 GTR & GTS-4 rear are a bit shorter in overall length.
They all have the Clevis rear mount:
R33 GTS-T, S1 Stagea, R32 GTS & GTS-T R34 GT All have the Eye-type rear mount. With very simular front and rear strut lengths.
Also The fronts used on the Clevis type are a fair bit shorter than those fittes to R33 GTS-T, S1 Stagea, R32 GTS & GTS-T R34 GT (from memory roughly a good 50mm) and when fitted are stupidly low at full height with no adjustment left. This is because their mounting point is physically higher on the front hub assembly to clear a front drive shaft (except the R34 GTT, but it shares the same geometry as GTR in the respect that is also shares the higher mounting point) (i am sure the R34 GT has the lower R33 Style (front) as it definatly has the eye type rear; but i am happy to be corrected).
Many combinations interchange, but you notice minute differences in length and adjustability between different models and brands of coilovers. I have measurements of different brands & what models they were made for from most the sets i have owned over the years.
BTW SOrry for the Hi-Jack