I'm gonna jump a little here since I'm a huge Rata Blanca fan. First I really don't want to listen to and English version of their music, I like it in Spanish as it was wroten originally (same happened with the English versions of Baron Rojo second album and Avalanch debut just didn't click as well, Sortilege did a better job when they did the English versions of their two albums, but I prefer the French ones).
Second RB is more influenced by Deep Purple than by Rainbow IMO, but since both bands had Ritchie on guitars is a matter os semantics in the end. And I won't call Walter a clone, but yes HEAVILY DEEPLY influenced