Even if copied It's very good, I don't think he'd do that, actually there is a thing known in poetry to be mafoom, (an urdu term, don't know much about english poetry!) mafhoom means the overall thought and its quite natural that many at times mafhooms match but the wording is some what always different, I mean even I once accedetialy did that, it matched the wording of an old song of the old devdas...