You might say opposite in terms of quality. That is to say that Marx was a particularly apt writer and managed to write a concise explanation of the communist position in only about 60 pages, while hitler ranted for over 400 pages about his personal path toward antisemitism. While marx and engels rely upon historical logic and communist rhetoric, hitler depends primarily on misunderstood science and pandering to german rhetoric. I wouldn't call MK and CM ideological oposites either because MK's ideological stance isn't particularly well defined. The CM calls for clear and specific political goals.