Yes, I’ve heard that the radio version of “Gunsmoke” was much darker and grittier. One of the writers, in an interview, was pretty clear about Kitty’s profession, in case anyone didn’t catch on. And Matt Dillon was a rather conflicted character, with a kind of shady past before he became a lawman, and didn’t always catch the bad guy in the end. Some of the radio shows are available on CD, and I’m going to order them.
Interestingly, most of the Big Radio WAMU Sunday 7PM streaming broadcasts always include a Conrad Gunsmoke broadcast. See http://wamu.org/programs/bb/11/06/#2011-06-06
There is usually a Sunday afternoon Freeper Posting reminder in "General / Chat" ...and... almost always a synopsis posting of that weekend's Big Radio programs including for Gunsmoke.
I usually listen every Sunday evening.
Regards,