This is the first time it's developing everything from the ground up, but it has quite the blueprint to work from as Shadow of the Colossus has aged very, very well from a design perspective. (eurogamer.net)
The main difference between Fascism and Nazism is rooted in the socioeconomic and sociopolitical climate of their country of origin, at the time they were developed, Italy and Germany respectively, which is deeply imprinted in both of them. (politics.stackexchange.com)