I found the episode of the Carol Burnett Show on Amazon Prime.

Season 4...episode 12

Funny scene where the girls smash each other with pies, and then both hit Harvey Korman.

I have no idea how to copy the scene and post it.

Fuckin' Hell! Geoblocked!

Damned Carol Burnett show, filmed before a live studio audience in North Korea,
being blocked in the United States. That must be why it's blocked.

Blocked in Canada, too

I seem to recall this clip being posted here about a year ago, so if you search for "Burnett" or "Debbie" or a combination, you'll probebly find an unblocked clip.