Both Jann Arden and Zoie Palmer appeared in Wynonna Earp, with Jann being in episode 3x07 "I Fall to Pieces" and Zoie in 3x05 "Jolene".
In episode 2x02, when Nora and Charley are talking, you can see a short scene of Wynonna Earp on Charley's laptop; Jann Arden and Zoie Palmer both appeared on Wynonna Earp. Ron Murphy directs both shows.