[Fyron]

When running a mod, only the races that are in the mod's Pictures\Races folder are used. What you can do is create empty folders for the races you want to be available in TDM into the TDM-Modpack\Pictures\Races folders. This will cause SE4 to be able to use that race when running TDM. As there are no files in the folder, SE4 will look in the default Races folder, and load the files from there.