Moon TKO in brutal fight of the year-type match up inside 5 rounds. Moon is on different level than Kim
Moon is a higher class as @Amos-san said (though he was very much class as well). However, this would be a brutal match up and likely FOTY. Moon would eventually maraude Kim with his off kilter shifting, overhands and unique sense of timing. This would probably be a TKO.
And Kim had enough close fights against very average opposition. I think Moon's class is the key factor in this fight
This would not be a competitive fight; nor do I think it'd be a Fight of the Year candidate, as some seem to think. Kim brought nothing to the table other than work rate and stamina, and those attributes would not be relevant in this fight. I do not believe Kim was a championship quality fighter, and he was lucky that he caught Orono after an appendectomy. But for that surgery, Kim would never have even been a champion, and nobody on this forum would ever talk about him - just like other forgotten fringe contenders of Korea's boxing past.