How do I pair my controller with other PS4 systems?
I used my PS4 controller with my PS3 and it worked but with the USB. Have you tryed pluging your DS4 before turning the PS4 on? Doing that when it's all on turn on the DS4.
If you want it wireless make sure your DS4 is turned off, use other DS4 to make the config, go to settings > devices > bluetooth devices. Then hold the ps button and the share button at the same time for 5 sec. When the controller you want show up at the screen select it with the other contoller then it's done.