Using cgi animation at the end of The Mandalorian to bring back a young man Mark Hamill, did not satisfy a good part of the fans. Thus, the idea arose that the perfect actor to play a young Luke Skywalker were Sebastian Stan due to his resemblance to Hamill, reaching the point that both actors have joked about being father and son.
With this in mind, the youtuber Shamook has used Deepfake technology to replace young Mark Hamill with MCU actor Sebastian Stan. And while they are not exactly the same, there is no doubt that Stan looks much more natural than the CGI recreation of The Mandalorian.
Here is the video in question, in which there are several scenes from the original Star Wars movies.