The cases of the Kinesis Essential, Classic, Professional, Advantage, Advantage Pro are all the same. They are available white and black. The silver Advantage Pro is a black case painted silver. There is no other difference. Keys are available white and black. The home row is blue on both color boards.
There are 12 different key profiles on the Kinesis Contour, not counting the rubber keys. Some of the keys match Filco/Filco clone keys, I saw that when I was at WASD Keyboards. I was supposed to try and identify all the keys for a couple people here on GH and add it to my Kinesis mod article. Considering my life the last couple months, I'm lucky to still be able to type here occasionally, let alone anything else, so I don't feel too bad. My suggestion is for someone with a Kinesis to compare with a Filco/Filco clone to identify as many Kinesis keys as possible and post it. Then it will be done before I get around to it.
In the future (spring/6 months from now) I will be involved with another GH'r making molds for cases, modified cases, and key caps. The goals are higher quality cases, different colors, modified cases, split cases, sooper kool kwality key kaps. It will be wonderful I'm sure.