Here is an image of a Chinese Copy Cat, which sometimes go by the "trade name" of Japanese Luck Cat, for comparison to an actual Mumbai Cat. As we all know, trade names often have nothing to do with the actual source of the cat.

I do not have any Javanese Copy Cats to help with this important topic - sorry!

As Fred has pointed out, it takes years of careful study of both originals and copies in order to distinguish them from one another, so please don't be discouraged if the differences are not readily apparent from photographs.