Nissan couldn't afford a full range of colours when building wiring looms for the Navara so many colours were re-used. Do you still have the 20 pin (M109) connector on the end of those wires? If so you can easily identify them using the pin numbers. If not then your task is going to be very difficult. Depending on what stereo you have fitted to your vehicle then the table below may narrow down the colour code and assignment for each of those wires. Check the AV section of the service manual for your vehicle for a full list of the variants.