Yes, done it myself
Yes you should check the pin/wire connections at each earpiece connector and make yourself a schematic (wire diagram or pin map) so you connect the correct wire to the correct terminal on the plug.
Here's the AK schematic for balanced plug (TRRS) connections:
Thank you for the schematic. I will look how the wires are soldered in the existing 3-pin plug and make conclusions for at least L+ and R+ wires. As for ground wires I will check with tester against earpiece connector pins to find out which one is left/right.