If the inventories are identical it might be that they change the Mark Up / Mark Down values, which affect how much the store buys and sells the items for.
Or perhaps both mods have made exactly the same changes? :) You could probably use the GFF Comparison Tool (
http://www.starwarsknights.com/tools.php#gmt) to quickly see what differs between the files, if anything.
Or it could be they have no set items but a random loot genarator
If both have the same OnStoreOpen script assigned (or no script assigned at all and having the random inventory script run from somewhere else) there wouldn't be any point to include a copy of the UTM file though, since you haven't made any changes to it.