I send AES over 30m of normal CAT5-E cable and have never had issues with it. I also used some normal cheap XLR connectors. My reasoning as pointed out above was that 110ohm is close enough to 100ohm and that the connectors are electricaly short. I have used it with:
X32 -> Symetrix DIGIO
Some ebay I2S AES board -> Symetrix DIGIO
X32 -> Symetrix DIGIO
Some ebay I2S AES board -> Symetrix DIGIO