Hmm, I hadn't even realized Earth & Sun was basically a simpler variant of the same puzzle!
Re: Binary: you are probably comparing it with this puzzle, right?
Although it looks similar, it is much easier than the King's Challenge because the puzzle from binary has only three labels (in that regard it's like Earth & Sun) and two buffer slots which make it a lot easier to move stuff around.
edit: Why does this stupid forum convert my pristine 28KB PNG images to ugly JPEG images?