Range (pick up & topspeed?) what do you mean? 1 is NA 1 is turbo, both are completly different. u might want to bear in mind that the GSR was never meant to be a performance car but the ITR was.
i would say it depends heavily on the launching....throttle control & clutch release (jumping the car) and each subsequent gear change speed (kicking the clutch has to be equally fast with the lunging effect).
ofcourse other factors cum into play lar such as good tyres, racing clutch, lsd gbox, shorter gear ratios. power gains well, i would assume both are light-tune cars so airfilter, exhaust piping, fuel reg, i/cooler only lor.