Router – nyway to connect to a Switch/Router console port with a RJ45-RJ45 cable

This is the pin out of the connector on the switch.

Pin 1 : NC                                  Pin 6 : NC
Pin 2 : RxD                                 Pin 7 : NC
Pin 3 : TxD                                 Pin 8 : NC
Pin 4 : NC                                  Pin 9 : NC
Pin 5 : GND

A null modem cable should work.

You're correct, standard ethernet cables won't work due to the wiring sequence - cisco uses what's called a "rollover cable" for their serial consoles. An example of the pin-out for rollover can be found here:

http://pinouts.ru/NetworkCables/rj45_rollover_pinout.shtml

It's as simple as pin 8 on one end is swapped to pin 1 on the other end, pin 7 to pin 2, etc. All the way down the cable.

If you have some Cat-5 cable, RJ-45 ends, a crimper, and the know-how to crimp your own cables - you can make your own rollovers fairly easily! If you don't wish to do that, I'd suggest searching for "Cisco RJ-45 Rollover" or similar in order to find vendors from which you can purchase RJ-45 to RJ-45 rollover cables.

P.S: Double-check the documentation of your KVM - some KVMs that allow serial management require their own proprietary adapters for it, even if the port on the KVM is RJ-45. If it does require a proprietary adapter, there's a chance that it will support standard RJ-45.