Well on paper there is more torque in a GTR - if yer talking 33 GTR then specs are:
Skyline R33 GT-R:
RB26DETT 2569cc DOHC 24 valve EFI Straight 6 Twin Turbo 208kw @ 6800rpm 367nm @ 4400rpm 8000rpm 1530 kg 5.30 seconds 13.30 seconds
Skyline R34:
25GT-Turbo RB25DET 2498cc NEO DOHC 24 valve EFI Straight 6 Turbo 206kw @ 6400rpm 343nm @ 3200rpm 7000rpm 1410 kg 6.00 seconds 14.20 seconds
So it will cost whatever is needed to decrease the 1/4 mile time to 13.3 secs. [assuming both stock].
Perhaps $1-2K spent on the right mods could get you into the mid-low 13's [full exhaust, intake, boost, etc]. look at rev210, he has recorded a 13.3 with standard turbo and cooler [r33gtst]. You would still have money left over...from not buying the GTR.
Of course the GTR is still a GTR!