I asked this questions on an email I sent to support at Flashzebra.com This is the answer I received:
"1) There is a listing of product attributes for the FZ #0126 and the FZ
0138 in ad copy for each (link below). Note that these are not identical.
2) Neither the FZ #0126 or the FZ #0138 supports TTL, but not that devices you connect then to also do not support TTL, so this is not an issue.
3) In general, the FZ #0138 is specifically engineered for the Canon version of the ISO hotshoe .The FZ #0126 is general purpose hotshoe usable on most flash units with an ISO type hotshoe."
I still would like to know why the 0138 has the same pins as the camera hotshoe? What is the purpose of those pins if the cable does not support TTL? If this cable is enginnered specifically for Canon flash units, how is that? What makes this cable different than any other mini-phone-to-hotshoe adaptor?