Yes, the 20th Century Fox TV logo appeared--but it was just a slide, it wasn't the film with the fanfare, and the audio was just applause over Dick Hyman at the Lowrey.
And it seems to me that the turnover from Narz to Wood was also brought on by the show switching syndicators from 20th to Len Firestone. Since 20th was still selling the '71-72 season to some markets (including Chicago, where WGN aired them in '72-73 after not airing the show for a year), Firestone would seem to want some sort of differentiation. Therefore, Wood becomes host, they tweak the format and make a set change. There's your differentiation.