I know when Sheena was on C&C with the dies and the wizard, she talked about the newer ones being larger than the older "classic" ones and that you did not need to worry about duplication of sizes. I think the older ones were cheaper than the newer ones but I would need to look up the shapes etc on the websites. Also with the newer ones, there seemed to be a lot of scalloped edges and I must admit it was these dies that have almost persuaded me to buy a die cut machine.