After the G-T shows returned in April 1998, GSN cycled through almost all of the Blyden episodes (seasons 5-7), with occasional skips, until reaching the end of the syndicated series in May 2000. Then, for the remaining months the syndicated version was rerun, they aired Bruner episodes from 1970, although I couldn't tell you which side of S2 or S3 they fell on.
Prior to the loss of the G-T lease, I think they were airing Bruner episodes from 1969 on the weekends, but I couldn't swear to it. I don't know how much of the 1968-70 seasons were rerun, and I don't think GSN ever ran much of 1971-72 (the last with Bruner), based on the lack of episodes in collections and the sketchy episode guides. The ones with Roger Moore and Frank Zappa guest spots are from that season, I believe.