Think about it both have similar things about them. The second KKK really wasn't behind the murders but rather individuals. The Black Legion, formed in the North, was pretty much a reincarnation of the group formed in Tennessee. They did the same exact things. They were thugs who burned up people's houses.
The black legion's targets included all immigrants, Catholics, Jews and blacks, nontraditional Protestant faiths, labor unions, farm cooperatives and more. There is no perfect answer. Yes and No. In terms of violence and intimidation they were similar, but in terms of their most common targets they were different. With the first KKK targeting blacks and pro-black whites exclusively. The black legion's targets included all immigrants, Catholics, Jews and blacks, nontraditional Protestant faiths, labor unions, farm cooperatives and more. Interestingly though the economic situations were very very similar. You had the post war south and the mid west during the depression, both with little to no economic opportunity. In terms of intimidation they were also similar, their goal was to look piss your pants scary, something even white people would be scared of because the normal white robes were associated just with being anti black. History will forget this group though because so early on they were brought down from within. The Black Legion had up to 30,000 members when they reached their peak in 1933, but in the period of three years in two separate murder trials 53 members were indicted, just on two murder charges. The state was willing to indict anyone even if they had the slightest suspicion they were involved with the murder. If the organization didn't come collapsing down from within so quickly they would easily be known as one of the most infamous groups of domestic terrorists in U.S history.