Why the Lion class was not a British Montana

Why call a Lion design a British Montana?

It should not be: the two classes were independent national designs, not counterparts created in response to each other.

Lion was a British battleship design developed for British requirements. Montana was an American design, and neither programme was conceived in reference to the other. Calling Lion a British Montana can therefore imply a relationship the designs did not have. Similarities between them do not establish that one was a national version of the other.