Even in 2008, there was some crossover. It was the stumble which taught this to me. Some Madyias and Jokers got knocked together and I couldn't pull them back apart.
And some Joker II's and something else got mixed together and I realized that there were too many similarities for me to be sure I divided them back up right. Was it Madyia III? (is there such a thing as Madyia III?) Anyway, I thought the Joker II's were unique but then when they jumped the wall into that other set I got a surprise.
I can't specifically remember which ones I got confused over because I kinda gave up and quit worrying and so it's fuzzy now. All I know for sure is that back then, when I was paying more attention to them, I found I couldn't tell some apart that I thought I should have known. And so I put the box away and tried not to worry about it.
But I've brought the 2008 box back out of storage now. So maybe I'll take another whack at it.