Entrecote is ojo de bife which is from the rib area. Bife de chorizo is from the short loin.
I'm not sure why there is so much confusion about meat, these premium cuts are basically the same as the cuts made in the US or europe. They look the same here as they do in butcher shops back in the home land, just a lot smaller (smaller cows).
I feel guilty now - you guys are talking about REAL FOOD and today because I didn't have the time to do anything else I grabbed some Burger King... Oh well lol