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they would be replaced with the same files.But as far as you have them nothing would change.
The only thing that will be different is that noobs will not get booted from the server

Visit

www.goreland.net and download the map pack.
http://clan-nwp.com/downloads/maps/Gore_Se_map_pack_1.exe
Install in in your main folder and enjoy the 2 new maps
1 remake of an old custom map...