I only noticed the two variations of the Terry Fator keys recently myself and I thought about being a turkey before sending it to you and putting the two keys on different pages...then I thought I would put them side by side and see what happens. The Fator keys are a perfect example of why I find collecting the keys so much fun -- I love finding those variations too. (Here's another teaser, although not one that's in the RR -- have you noticed the back variations on the red Grazie Venetian keys? I know of two versions...and they have the exact same manufacturer code).
I'm thrilled that you enjoyed the RR Esther. I always worry about those with larger collections being able to find something they need in the group - it's much easier for new collectors to find something in the RR.
Have a great weekend!
Jim