It is as far as I know. We've discussed the fact a few times when it was with its previous owner, Paul Stewart, back when he allowed Martin Brundle to use the car in his "Supercars" DVD.
If you look again, you'll see it doesn't have the additional fender flares in the front, and because of this the front splitter is not as wide. I've taken to calling it the Partial High Downforce Kit.
>8^)
ER