They are both totally different games and have different features, you can simply test that by comparing the demo versions or the
videos on youtube. CPD will surely be a good game, but it's not even out yet. There are a few similar puzzle games out there, not just one, and all have a different style of gameplay. In it's own kind Zany Doodle is very unique and has a lot of unique features. No other FPS is a copy of Doom and no other Jump'N'Run is a copy of Mario. Games are made to have fun with and it's not like anyone is forced to play just one of them. The development of this game started long before it was even announced, that CP will be made into a real game and I think you know that developing software is a little bit more work than having an idea. Games ideas do evolve and I don't think that anyone considers this as a bad thing...