I think that there disagreement was in style more than substance. They basically disagreed on who would rule the world, not on how.
F.A. Hayek was explicit in his comparison of the Nazis with the Communists:The Road to SerfdomDistinctions, scarcely any difference . . .
(Link to the Readers' Digest Condensed Version in PDF)
Thanks for the link.
Or as Monty Python put it in the Life of Brian, “The People’s Front of Judea” vs “The Judean People’s Front.”