I have a Roku Ultra and an older Premiere+ (not a stick). I am controlling both of them with Harmony remotes in separate setups. Does anyone know if the Ultra and Premiere+ use the same IR codes? I would like to try swapping the two but want to avoid having to change my Harmony setup for both.
Yes, they do.
ALL Roku streaming devices with IR receptors respond to the same set of IR codes.
Roku TVs (those with Roku capabilities built in) respond to their own different different set of IR codes.