yeah they will physically fit, but since the weights (and distribution of weight) is different between the 2 models, handling characteristics would be slightly different. But if you got height and damper adjustable coilovers, then a good suspension place could tune the damper to the weight of your car with a good level of success. Even better if you get somewhere that does individual corner weight suspension tuning - then you can decide how hard/soft you want each corner to be. I had R33GTR coilovers put in my R34GTT and hated them - as the weight distribution difference between a R33GTR and R34GTT is just too great. You might get away with R33GTsT vs R34GT