It is possible that when the stories of Romulus and Remus were first being created, they may have been borrowing from the stories surrounding Cyrus (or perhaps it was the other way around). There are several common tropes for ancient foundation tropes. For instance, some societies were said to have been founded by individuals who had travelled around the Mediterranean, often to Egypt, collecting esoteric wisdom before returning home to found societies (e.g. Pythagoras, and Lycurgus, who radically reformed Sparta). The same themes and stories are often seen across the myths of different cultures and the same archetypes.