[Posting this in Central as the Press release that I found was released by the KTA]
https://www.ksnt.com/news/local-news/regional-travel-is-easier-ktag-will-soon-work-in-colorado/
https://www.ksturnpike.com/KTAG-Colorado
In a Nutshell: starting this coming weekend, Colorado's ExpressToll will be accepted on the Kansas Turnpike, and KTAG will be accepted on the Toll roads in Denver.
I don't see any word on whether Colorado is fully joining the midwest interoperability agreement, which includes Oklahoma and Texas, or not.
FYI: https://www.aaroads.com/forum/index.php?topic=34475.msg2925678#msg2925678