The Babylon Project had some serious flaws - it was set before the show and there was no mention of any of the events in the show. The current RPG embraces th events of the show fully. TBP had very few pictures from the show, while this uses photos liberally. TBP failed to take off, the current RPG has numerous supplements. The current RPG is a fully realised RPG that fully immerses players in the universe, while TBP felt like it skimmed the surface of the universe and didn't quite cover the rules in the depth that was needed.