I always thought the front were exactly the same, but apparently the copyright information differs (the Japanese ones mention 2010 Pokmon/Nintendo/Creatures/GAME FREAK whereas the English ones mention just 2010 Pokmon/Nintendo)
Finally, pulling up in the last slot, is either an advertisement/token card, a minigame card, or a reprinted card from Magic: The Gathering history part of The List
For the two foil cards in each deck, the text box is darker with inky tentacle-like decorations shooting out from their frames but the art and abilities are the same
If they look blurry, missing, or the shape is off, you might have a fake card
They won't gain life, but any other effects of that spell or ability will still happen
Its got almost everything I want from a virtual card game, and pretty soon, it will even have trading too