I think both share the same theme of camaraderie/brotherhood/friendship. The classic "the real treasure was the friends we made along the way" shounen trope fits these two dramas. TBOY is more serious and dramatic (but there's still humour at times), whereas IAM is fully packed with comedy. I think IAM is a wuxia as well, so that's another similarity. There are a lot of powers, techniques, and sects in TBOY, just like IAM.

The main character in IAM is the descendant & inheritor of one of the most powerful man in the universe so we can infer that he has the potential to be the The Very Best™, though arguably not as OP as TBOY main character.