This is an extraordinary resource for information about old radio game shows. There's some detail in the descriptions that I didn't know about before, including for some of Bill Cullen's old shows. Unfortunately there just aren't a lot of us left who care.
That said, there is at least one point of caution-
Mr. Keen, Tracer of Lost Persons was a dramatic series (and one that lasted for a rather long time at that), and the listings I've seen from the 1951-1953 period do not seem to suggest it having a format change during that time.