Early Saver question

Are the old and new Early Saver prices interchangeable? With the addition of new price structures, I'm so confused with ES. I booked a European cruise about a year ago with the old early saver price structure. When I look now, the price of the cruise has dropped $50 per person, but I'm not sure if it's the same as the old early saver.

It seems like this cruise booking has been messed up so many times I don't want to add to the problem (I booked on Legend, when that cruise was canceled, the Carnival agent seemed confused when I called to rebook on Sunshine, wanted to charge me another deposit, plus my OBC got rolled into my deposit paid--not that that's a bad thing, at least I know I got my money).