One should not fall victim to semantics. However, even in case of displaying similar characteristics between works here and there, it's only up to the magazine label that determines if something is Shōnen/Seinen, Shōjo/Josei etc. It won't tell you much about the show's actual content without knowledge of the publishing magazine and mangaka. There's substantial room for speculation after all. Too woolly and imprecise terms to accept them as genres; which they weren't in the first place, anyway.