Yes, this video shows the Porsche coming out on top. Even when the Gallardo gets the jump the Turbo reels it in. With the final race where the UGR Gallardo gets a massive a different angle would have been quite useful but every single run establishes the Porsche as the faster car.
Some users on the forums are calling BS but they need to keep in mind turbo Gallardos come in all kinds of flavors ranging from 600 wheel to 1800 wheel horsepower depending on what one spends. With a 996 Turbo it is no different it simply depends on how far one modded their car. What is clear is that both can be potent.
Video below. Both cars said to be in kill mode which means at their best.