Another Thing v Thing-that-can't-fight-itself-and-must-fight-first-thing game is probably one of the best early TCGs out there aside from its binary play style, is Richard Garfeild's Netrunner. Oh baby that game was / is hot. Only two sets of it (three?) were ever released, but if you can get your hands on some of it, its hot. Both card stock, art, feel of the cards and rules. delicious.
Man we're off topic...
But yeah, like others have said. Thing vs. same-thing most likely possible. Don't think any gaming company is going to make THAT mistake again any time soon...