Very different?
you don't really understand the different underpinings of the various totalitarian movements of the 20th Century.
Well someone who says that communism is "based on economic theories" doesn't know what he's talking about at all, and, in addition, is a menace to society if he is in fact spreading such misinformation.
Very different in what they were based on and on their overall goals, yes. Of course, those ideologies used many of the same methods to get where they were going, but each one had a different destination (even closely related ones, like fascism and Nazism differed in their final goals as well as to the extent of who they allowed into their respective movements).
Well someone who says that communism is "based on economic theories" doesn't know what he's talking about at all, and, in addition, is a menace to society if he is in fact spreading such misinformation.
At base, communist ideology calls for the establishment of a dictatorship of the proletariat through control of the means of production and the suppression of the "parasite" capitalist and bourgeosie classes. Its underpinings are purely economic, rather than biological.