Ask for information about an extra actor on Superman III (1983)

Yesterday I was watching Superman III and I noticed something rather strange. I was sure that in one scene actor William Mapother appears in the film but as an extra. This person (whoever they might be appears in about 39 minutes 10 seconds of the film, depending on the version) After I finished the film I went to look it at imdb but nothing. He's not in the film's information and cast and etc.. but neither the film's is in actor's filmography. OK I get it. Maybe is just look alike. But the funny thing is that everything about these 2 "unrelated" people is the same. Their face is the same. Their hair is the same. Their hair's color is the same. Their age age is also the same. The time that his carrer started is also about the same period as this fim came out. He was about 15-16 at the time I believe. Even their height is the same. Maybe he was shorter at the time. Can anyone help me with this. Please don't lash out on me.  I geniusly ask. I am curious. Maybe imdb didn't know about this so that's why they didn't put it. Or maybe is just a coincidence after all.