If you think about it, these two could be related.
Korra’s paternal grandfather was the Northern Water Tribe’s Chief until her uncle, Unalaq, succeeded the position. So we can assume that NWT’s leadership is hereditary.
Arnook (chief from ATLA) didn’t seem to have any other children besides Yue, so this theory hinges on the possibility that Arnook was succeeded by his blood relative.
Friend: What keeps you up at night?
Me:
Okay but now im imagining like… her and zuko interracting.
Zuko: So youre the new avatar? tell me about yourself. Whats your family like?
Korra: Well my dad said that my great aunt turned into the moon
Zuko: ….
Zuko: Thats rough, buddy