Yes, this^^^^.Easiest way to tell as far as I know is by location and type of activity - northern fowl would be active on chickens during day, red mites would be more active at night on the roost.
Here a good post about mite ID by Lady McCamley:
https://www.backyardchickens.com/threads/my-chicken-has-mites-now-what.1273674/page-2#post-20483008