The original set was demolished upon the cancellation of the first run. A new, second set was built from the same plans as the first set, which is why it seemed "practically exactly the same". In addition, the show moved from studio 41 to 43 and a new music package was produced.
There was a show where the set was saved after the show was cancelled and reused when the show was brought back. Can you name it?
CBS $25,000 Pyramid?
I think you're on the right track, but I think he's referring to the 1991 John Davidson version reusing the same set from the 82-88 run.
Actually, I think Davidson Pyramid was one of those instances where they rebuilt at least parts of the set using the same plans, if not the whole thing. Case in point? The Winner’s Circle trilons. The Clark version’s set design in the 80s still looks like a fourth row could be added to the Winner’s Circle pyramid. The Davidson version does not.