Honestly, other than the people involved with the implementation of the systems, most of us don't know yet.Will these two systems be able to talk to each other or have a common channel?
Denison had their swift water rescue team in Sherman today working on an accident where a family of six went off the highway and into the drainage system. The boat crews and Sherman dispatch were having lots of problems communicating with each other.
Both systems have enough coverage that units from either agency will have decent service in a majority of the County.
Is a link between the two possible, yes. In Collin County, the PAWMCo and Frisco systems have a couple of talkgroups that patch between the two - one for FD mutual aid response between Plano and Frisco, the other for Prosper and Celina. Not sure if Frisco also has a connection with Denton County for mutual aid to Little Elm (I know that Frisco has a dedicated TAC channel for FD Mutual Aid, just not sure if there's an actual patch from that talkgroup to a talkgroup like PAWMCo has - I never mapped it out)
Of course, there's also the statewide simplex mutual aid channels as well for a Marconi level fallback, which most of their new radios will probably have programmed in their code plug.