I know that some US segments did get aired on Sesame Park, mostly animation by Bruce Cayard and Bud Luckey, and some Muppet sketches. I wouldn't have thought that US film segments would have aired on Sesame Park until I realized it aired "Everybody Eats" (refilmed version with Joe Raposo on vocals) in a 1998 episode, and "Write Your Name" was definitely produced in the US (it first aired in December 1994, two years before Sesame Park launched on CBC), and I remember it being aired on two episodes of Sesame Park.
Sesame Park tended to devote the majority of each episode to Canadian content, and less material produced in the US. Typically, we did see two Muppet segments from the US version on each episode and one or two US produced animation or film segments. Though on some episodes, we only saw one US Muppet sketch, and replacing the other US Muppet sketch was a "Basil TV" sketch with Basil the Polar Bear with footage of various 1990s Canadian kids involved. On one full early episode of Sesame Park, there was a computer-animated school supplies M/m segment, and that, we all know, was produced in the US. Muppet and Kid Moments were not featured on Sesame Park, as far as I know.
But yes, the Mad Painter sketch being shown on Sesame Park may be likely, though wouldn't Paul Benedict and Stockard Channing have had to be paid royalties for using their appearances? They were still alive when Sesame Park aired on CBC. Also, Sesame Park involved heavy use of transitions between segments and/or scenes.