I sort of had trouble telling them apart at first, in the face-panels where you can't see what shirt they're wearing. Now I see the difference--it's all in the eyebrows.
At first I just accepted it as "Oh, a super-friendly businessperson. He's like that neighborhood mom who always tries to feed all her kid's friends," but by the point where he segued into talking about Paris, then I looked back and said, "Flirt."
Mon-El's sure come a long way from waiting on a cure for lead poisoning in the Phantom Zone.