Manga Gohan training for the tourney a little while later and anyone stronger than manga base Gohan.
He's the same character for all intents and purposes. Hell according to Toriyama the Manga/Anime are supposed to be the same. He's just got a little expansion on him with the "filler". We're seeing the manga/anime being the same regardless of differences playing out in the Super vs Movies angle. Where Toriyama's direct work is being played off as less canon than something Toriyama didn't have as much control just like the anime vs manga thing.
But I digress on that.
Either way, he's still done the same things in the manga and failed to the same people as he did in the anime. One extra feat doesn't make him more powerful. It just means he can do it. Even if they are different characters, his power level is the same. Which means he's weaker than SS Trunks/Goten, possibly Piccolo and Android 18, Supreme Kai, Dabura, base Vegeta and Goku, Buu, Yakon, and so on. You'd be hard pressed to argue that Manga SS2 adult Gohan is weaker than Anime base Gohan pre training for the world tourney.