Cultural Bolshevism is the Nazi term for the conspiracy of "the Jewish people are secretly puppetmastering the Communists to destroy the West." It's in Mein Kampf, etc.
Cultural Marxism is the new coat of paint that the alt-right is using and it refers to the conspiracy theory that evil Marxists have infiltrated media, academia, and science and are engaged in a decades-long plot to undermine Western culture. According to Jordan Peterson and other such people aligned with the alt-right, basically all modern social liberalism is a Communist front group and they want to brainwash your kids in their lib schools with identity politics. Peterson is, of course, constantly confused as to why this attracts neo-Nazis to his fan base
People like Anders Breivik have directly referenced their fight against 'Cultural Marxism' in their 'manifestos.' It's just basically the same thing again - "the Jewish people are puppetmastering the left / communists / feminists / LGBTQ+ in order to destroy Western culture."
The notion that Marxists are simultaneously losers without jobs but also they have infiltrated all the upper echelons of our society is a niggling issue that is ignored.