I tried this myself with one of my female betazed science officers...however when I loaded the saved uniform, it also turned my officer into an exact replica of the original one I saved the uiniform on. I had thought that the uniform save feature and the facial features save were two seperate things, but I'm guessing not.
I found the problem occurs if you change the name of the costume. Leave the costume names to the default and I don't have the problem.
I discovered this when I modified some bridge officers, then changed the costume name from the original BOff name to the new name I had give the BOff. When I tried applying the costume to another BOff of the same species/gender it wouldn't work.
I tried this last night and it still didn't work. I know I changed the BO name and costume name on them, so that is probably it. I'll have to try it without any name changing to test it out. Name changes shouldn't really matter though...