Forum:Harpie Ladies effects?

Im not sure about this, but with all the Harpie Ladies, (1,2,3 and Cyber) their effect states that the card name is to be treated as Harpie Lady, does this limit the amount of these cards you can put in your deck to three, or does this mean that only during play does the effect mean anything, their names techniquely are different, I have heard both sides of this story, so which is it, and could you give me some proof, I have read the Wiki article on it, so if you could find proof other then that it would be wonderful I would like to settle this debate once and for all.