That's a good question. At first I was thinking obviously parallel since the only difference is the back. However, since they came as a full set and wasn't inserted into the set we have listed, I would argue maybe it should go as a different set. I guess some could argue it would be a variation, and if convincing enough I guess I could see that too.
I can't wait to see the replies. I just hope they don't make a similar "updated" set anytime soon.
Royal Card Review is my blog if you feel like checking it out, thanks if you do!- royalcardreview.blogspot.com/
In the process of updating my collection so don't trust any of my lists right now.