Kyuu I think you have it backwards. Lupin was first, so you compare the similarities in Kaitou to Lupin.
I know he's based on Lupin, at least as inspiration, and while I knew about Lupin first, I never compared them. Maybe because I see Kid doing it as a magician who is a thief, and Lupin is more of a high white collar thief? I've known magicians and done stuff with them, so I see it differently, I think. And on that note, I've talked a great deal and shown some clips to our old coordinator on how to do some of Kaitou Kid's antics, and so far the only thing we've found that couldn't be done is that his card gun wouldn't really be able to shoot rolled cards like it's supposed to. Even quick change can be done that fast, apparently. Granted we haven't discussed everything, but I can't think of anything off the top of my head that's flat impossible.