@epistemophagy presumably nusach ashkenaz and nusach sephard (which, confusingly, refers to ashkenazi jews from central/eastern europe who over time adopted some of the sephardic traditions - sephardim have a bunch of nusachot of their own lol)

[edit: ok it makes much more sense to be what the other commenter replied, i honestly know jack shit about most haftarah stuff]