One of those questions that will probably never come up in a game, but hey, you never know...
Can you have both Ram with Two Horns and The Ram with Two Horns and Goat with Horn and The Goat with Horn in your deck (assuming T1 under 100 cards)? Since one of each is an EC and the other an enhancement, I don't see why not.
Besides, they are no exactly the same brigade (since the ECs are dual), and the name isn't exactly the same, although the artwork is. I doubt this would become a game-changer anyway (although I'm open to seeing someone come up with an abusive combo using these cards).