Yeah Kazekage Gaara vs. kimimaro would be extremely short, even if Sabaku Sōsō or Sabaku Taiso still can't finish him with pressure, Naruto has Rasengan/Rasenshuriken which I'm sure would break Kimi's bones at any time post timeskip. I think Sage naruto vs Orochimaru would be close, SM makes naruto more versatile, but less raw powerful than he is in 4/6 tails. (Note: Sage Naruto didn't beat Pain, at first he had to force himself into sage mode just to keep his head above water against the paths, and then Deva went one on one with 6 tails for the majority of he fight. Then Naruto is magically able to revert o normal and be totally unharmed AND able to go straight into sage mode again. Deva got trolled IMO.)
But i still give it to Naruto and Gaara they have too much chakra to begin with, I think Oro could at least trick them and escape mid-fight or something as he tends to do