Your best option is to "Tone out" the cables.. This is easier than it sounds using a Cable Tracker or using a cable toner
What's a cable toner? Two devices one sends an audio tone down the cable it has a common "F" type connector and a battery and a switch
The other is basically a speaker with an "F" connector
Hook the transmitter to one end then hook the speaker to cables till you hear tone.> label it
Cable tracker is a Radio transmitter and a receiver very directional receiver.
Hook to the SHIELD (nut) on the wire to be examined (And if there is a ground around hook to it too or hook the ground lead to a good hunk of metal)(
Point the receiver wand at the assorted cables and the loudest BEEP is the one.
Method 3
Battery. test leads (or short coax.. connector on one end. other end stripped and hooked to battery) 9V retangular is good here
Now using a 12 volt automotive test light Test the other end and the one that lights.. Label both ends.