uh, that's a horrible way to do it... it's much cleaner to just use -configsubdir in your command line, so each configuration goes in it's own file.
Eg:
UDK.exe server CNC-Field.udk?game=RenX_Game.Rx_Game?dedicated=true? -port=7777 -configsubdir=server1
UDK.exe server CNC-Field.udk?game=RenX_Game.Rx_Game?dedicated=true? -port=7787 -configsubdir=server2
7778 is normally used as a port within the UE3 engine, you should change this in your UDKEngine.ini file, for each server