Not sure if this falls into the category "Sounds similar to one another" or "sample," but given how exact these intros sound to one another, I'm leaning more towards the latter:
http://www.youtube.com/watch?v=0aJXsl8qESw (Granado Espada "El Momento Pasado)
http://www.youtube.com/watch?v=kWQczQ0gATk (Deathsmiles "Hades Castle)