I have a USB wire with a purple, pink, light grey and green wires inside, plus metal sheathing.

Which wires are which do you think? I know normally red power, green data+, white data-, black ground but what is your thought on the above combo?

Pink power, green data+, light grey data-, light grey ground?

(In case this helps your interest, this is the combination for a Razer Blackwidow keyboard)

Look to see if they're in the same order as the other wires?
Just a guess
Purple-ground light gray-data pink-power green-data :)