Toei never animated Naruto vs Pain, and saying they did is not the insult you think it is. Naruto vs Pain is one of the most bonkers well animated episodes to ever come out of a long running shonen. Its an episode well animated episode.
Also, the spin really isn't that different. Its just how that one animator draws Page One. Their name is Masahiro Shimanuki. They draw characters like potatoes.
look again, Oda made it detailed, from low to high to low again like a protractor
TOEI made it like they just put a high square on his back