since this looks around the 5730-6609 patch you can definitely just swap the files, guildwar map is faction. so just take the files from the map and ani folders for a direct swap.
.dmap map/map
.pul map/puzzle
some files have swapped to .pux around 6609 from what ive seen and they did change the GW map somewhat when they went full 3.0 and swapped TC to the Market/TC design but it should be an extremely easy direct swap. i dont recall if you need more than that but i have spent quite a bit of time making maps and editing maps so you shouldnt have much of a problem adding/fixing that. just make a copy of what you swap incase something goofy happens but its like a 30 second fix.