The impedance of a mic cable is largely irrelevant. You have some small amount of resistance, which is trivial compared with the input impedance of a preamp. Then you have cable capacitance, which we can consider nominally as 30pF/ft. Better cables are somewhat lower; a poor or small-diameter cable might be higher.
But cable capacitance is generally not an issue until cable length gets well over 100ft (really more like 300ft).
The major issues with mic cable quality are the durability of construction and the coverage of the shield, and also mechanical issues such as how easy it is to strip & solder, whether it lays flat, etc.
AES/EBU cable can be used as a mic cable, but the reverse is not true. AES/EBU cable is specified as 110 ohm, whereas RF performance does not matter for a mic cable.