I took the 4th ("S") and 3rd ("I") Hartge keys from the first post and compared them below. I had heard that the valet key was shorter and that's clearly the case. Also looks like only the part of the key to the right of the line is used by the valet key. The one thing I couldn't confirm was that the center channel is supposedly wider on one compared to the other. That doesn't appear to be the case.
UPDATE: check post 35 below

Anyone know for sure?
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