Compare the two vids above.
I'm sure that its the the "fake" vid shows the hairpin towards the end of the BTCC layout, and you can see an "Autosport" ad. Look at the same point on the supra vid (~1:31) and there ain't no Autosport ads...
Can you change ads in the rFactor one? Although apart from that, they do look similar...
EDIT:^Ifailed.