I'm not so sure they do match up perfectly. If you look at the pink one, it definitely doesn't match up where it's folded. It's hard to tell with the other two but I don't think they match up either. I think if you really want it to match, you'd have to fold the card the way it will be when finished, stamp the one in the front, cut around it, but cut both layers, and then use a stamp positioner to stamp the one behind so that it matches up. You would only have to do this for the images that have another image right behind it.
Also, like Jeri said, stamp both sides of the paper.