How do you think your version of the character would react to meeting their canon-self?
Depends on which version of canon you mean. The butchered english dub version, he'd probably wince at, but would tolerate. He would mostly wonder if he was that much of a terror as a child. He'd try to be understanding and gentle but it's a very jarring experience and he needs a minute to b r e a t h e . He has not truly processed his own trauma, so having a hyperactive, selfish little kid around whose loud, maladjusted behavior is a reflection of similar trauma, is just a lot to handle. And he probably couldn't do it for very long.
For the manga/japanese dubbed version? It's a lot easier to handle. Maybe there's some bittersweetness there, knowing that this alternate version of him get adopted and has some kind of family despite the pirate bay situation never being more than a notion. Like damn, this kid managed to snag more nationfolk found family. Good for him! (What did I do wrong?) Plus shame, and trying to hide his issues with substance abuse. He's fine! He's gotta pretend to be more put-together since he was the one gifted with age, so. . . He's fine, honestly! But most of it is just memes, joking around, and trying to make the kid version of himself happy.