You should have made backups of the files you overwrote when you installed the mods.
If you have the Steam version, you just right-click on Warband, go to "Properties", then "Local Files", and choose "Verify Local Cache" - Steam will detect the altered files and redownload the originals for you. If you have some other version, you'll have to redownload and reinstall Napoleonic Wars to overwrite everything with the stock content.
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