Yes, it's the same ammo for all intents and purposes, the zombie ammo thing is just a sales gimmick. I read an article somewhere, maybe Shotgun News,? even a Hornaday big wig says the zombie ammo is being bought by people who don't even own a gun just to display it somewhere.
I'll see if I can find that article again. Nevermind it looks like it might be just a few posts up.