For black, maybe even lower (500-550) because he missed a mate in one in the game and gave a lot of pieces (and just missed a lot of good moves in general)
Black resigned after getting the queen pinned, so less than 1000. Both white and black tried a version of scholars mate. White's blunder of the knight makes me think White is around 540. Black did ok, but made some serious blunders. I would say that Black is around 500