Freedom Force vs The Third Reich is, in essence, more Freedom Force. Same engine, same characters, same voice actors, same writing style, same art. It would be more honest to call it a stand-alone expansion, in the vein of Homeworld: Cataclysm, than a true sequel. In fact, the Cataclysm comparison is very pertinent. For not only is Third Reich more Freedom Force, but it's a better, more polished edition.