Yes, an NA Supra has 500cc over a 25 R32 but also has a good hundred+ kg's too.
Straight line speed, I dare say the extra torque of a supra would be quicker than a 32.
But this less weight combined with a couple of corners where braking and handeling become more inportant I dare say a 32 would be quicker.
If you you take into consideration the price difference between an NA Supra and an NA 32 with an RB25 and throw the difference in cash at the 32, it would begine to leave it behinde as well.