I notice there is a group of two with an exact obverse/reverse match, and then there is a group of 3 with a matching reverse and one has a different obverse. And, those in each group have similar coloration. As noted already, ancient coins like these are hand-struck individually, so the flan shape and position of the strike should be different on all. While I don't know the odds of finding die matches, particularly with a different obverse

, it's far more likely that all the coins are copies from the same source.
