There was never an original with "kid named paint", it was always "kid names finger", and r/OkBuddyChicanery just had so much brain damage this became the top meme of all time.
There are many stories about Daniel Radcliffe being confused for Elijah Wood and vice versa; this one is pretty good:
Radcliffe also shared a funny story about an occasion where he was mistaken for Wood, but because of a language barrier, he signed an autograph anyway--with the words, "I am not Elijah Wood."
"I was once on a red carpet in Japan and a photo of you [Wood] was thrust at me. My first instinct was to say, 'Oh, I'm not ... So I can't ...' but I thought the language barrier would be too much," Radcliffe said. "So the quickest way to deal with it was just to write, 'I am not Elijah Wood, [signed] Daniel Radcliffe,' and then hope somebody translated that for him later."
I remember reading some batshit pitch for a movie once where it was something like a buddy cop thing with Vin Diesel and Terry Crews (both IRL dnd-playing nerds), and they had to go undercover at comic-con to stop some terrorist plot. Point is, the bad guy turns out to be Daniel Radcliffe (played by Elijah Wood). With his lackey, Elijah Wood (played by Daniel Radcliffe).