There are plenty of KO Monopoly board games, just after Christmas I went to Penrith markets and they had some obvious KO versions, Toy Story, Ben10, Hello Kitty etc, and some less obvious ones, like Simpsons Halloween edition, transformers, Pixar etc, so there is a chance you may have gotten a KO...
If Gok or someone who has the proper version could post pics of the board etc, it might help you identify any differences...