AFAIK, Geng Pet is the generic name of the paste. BTW, it is prepared in large batches, and can be stored for months. There is a large selection in the Siam Paragon Supermarket if anyone wants to see what it looks like, or the differing varieties. Some cooks actually have these pastes sent via the mail from their hometowns.
Again, AFAIK, and I'm no expert, Geng Deng would be Red Curry as Deng (Daeng, or si daeng) in the word for the color red; Sala Daeng on the BTS: Red Roof, Din Daeng: Red Earth, etc. Geng (curry) KeeOw (the color green) wan (sweet) would be sweet green curry, which can be spicy or perfectly balanced and sublime.