Deliverator
Graphical Hackificator
If you unzip the dragoon you will find two files inside...
Replace the imperial musketman and imperial dragoon to have updated files. Please make sure you backup your old files.
I know that there are two files, but one of them is the wrong file I think. You have two different versions of Vet_Dragoon_Horse_DIFF256.dds and no copy of Veteran_Dragoon_DIFF256.dds.
I've tried every combination of overwriting the Imperial files with your two files and it didn't work. Can you check you have the two correct files in there please?