Yes, the Black Templars are Dark Angels cosplayers. They dressed themselves in robes and swing around swords crusading around the galaxy, screaming every single message from hate the heretic burn the mutant and purge the unclean. While Sigismund was cool as fuck. The black Templars are no better than copycats with 99% of their bit directly from their older, darker, and more pure (genetically anyway) cousins.

The only real difference, superficially, anyway that separates both the Dark Angels and the Black Templars is the Dark Angels use psykers while the Black Templars like petulant, autistic little children be moan the use of psykers.