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Re:NixOS – Purely Functional Linux Distribution by dtzWill on Friday November 02, 2018 @12:10PM (#18364126)
And in particular guix uses nix internally-- but (AFAIK) at an API level and very little of the nix language.

So it's rather related for that reason :).

Re:NixOS – Purely Functional Linux Distribution by davexunit on Friday November 02, 2018 @03:00PM (#18365731)
Guix uses a fork of the nix-daemon (for now), but otherwise uses nothing from the Nix project.