I should better explain my situation:
Instead of buying the entire assembly I just purchased replacement motors. I can't seem to get the photo uploader to work but there is a definite difference in size between the two motors; the GT model is much larger and will not, in any way, bolt into the shroud.
I did some digging on Hueburger's website and found that the fan blades for the 2.5i cannot be purchased separately from the motors (can only buy the assembly), so there's no way of knowing how the part numbers compare. eBay hasn't been much help in trying to identify differences either.