Was that sim-sub, or CBS programming in general, even if not being aired on both stations at the same time?At first, KFXJ/KREX wasn't interconnected. It's possible it could have received CBS programming via private relay from Colorado Springs but I haven't found any indication of that.
Newspaper listings indicate that KREX received protection on the Grand Junction cable system from KMGH network programming.
The KREX/KKTV sync-up struck me as a bit odd, I wonder if those two stations took the live feed from the ETZ, rather than rolling tape and running it later. I'm not well-versed enough in what the "normal" daytime schedules (that is, ETZ with CTZ an hour behind, or PTZ using the same time frame as ETZ) looked like for CBS (and other networks) in the late 1970s. I'm not clear on when the MTZ got its own feed, but it doesn't seem to have been as early as 1977, otherwise you wouldn't have the hodgepodge that you do in the Colorado edition.









