It doesn't really matter anyway. Even if you think 2000s Rafa was better than 2010s Rafa on clay (like I do), it's not like prime Fed was going to beat the 2010s Rafa on clay and prime Novak isn't beating 2000s Rafa on clay either. Roger probably would have beaten most versions of 2010s Bull on grass, just like he actually did in the 2000s, losing just 1 epic nail-biter. So not much changes there. Would prime Novak still be undefeated at Wimbledon if he got 07-08 Rafa instead of 11/18? Idk. Probably, but it would be close.
Hard courts is the clear divider here. Hard court was the last surface he peaked on, so prime Novak simply played more matches against Nadal on the surface than prime Federer did. And we saw Federer already struggling against 2000s Rafa even then, the match-up advantage was so strong that it compensated for Nadal not totally having hard courts figured out yet. There's no way around that, so Federer would probably struggle even more against 10s Nadal. He might be 0-3 instead of 1-2 against 2010,11&13 Nadal at the USO. And the big difference is in Australia where both played 1 really good Nadal, Roger lost his final in 5 (09) and Novak won his (12). I think 12 Novak beats 09 Nadal and 09 Federer still loses to 12 Nadal.
idk if any of that made sense or not