You mean Keith Prentice. Boys/Band was filmed, I think, sometime in 1969 with a 1970 release date. While the original cast was filming the movie, Don Briscoe was playing in it on Broadway (this was while his 1897 character Tim was "away"). Interestingly, Christopher Bernau who later appeared on DS as Philip Todd was also in the 1969 replacement cast in the B'way production of Boys/Band.
I think there may be other links between DS and Boys/Band, but I can't recall offhand.
G.