Someone asked a question regarding the differences in these four cards. notice that the art and visual representation are the only thing that has changed in the two augustus systems and the two polybian systems... not the way the card is, OR the reference number...
If there is a difference in the card then it may not necessarily reflect in the card name. Maybe the name is the same but the numbers are different... How can this be? Look at the reference number above the copyright information. Take these three cards for example:
there are other examples of the name of the card being different but not having any modifications to game play that are reference cards themselves. this is just for your enjoyment and ease of play. they are basically like the first type of card. no real change... here are some examples of that.
hope this clears up any confusion!