Cheers and Wings have a very long chain of cross-overs. Therefore, their universes are the same. However, Hugh Maguire plays Hugh on Cheers, and an unnamed businessman on Wings.
Brian: "Shannon has changed, she's kind, she's caring. Think, Mother Teresa in leggings."
Lowell: "That's so weird, I just was."
Fay: "Shannon Moss? I think that's the exact color I painted my kitchen."