That clip of the Exhibition could have been it.
Both Oksana & Maxim and Meryl & Charlie were at JGP Belgrade (Sparrow) in the 2002/2003 season. Oksana & Max won, & that was the same season as they did that exhibition at Jr. Worlds. Perhaps they did that number in Belgrade. BTW, Meryl and Charlie finished 6th, and I'm sure the moms would have been thinking of them as "Little Meryl & Charlie" in that year.
From their bio, it looks like that JGP was D&W's first junior competition.
Here's their Chocolat FD from their first season in juniors, 2002/2003. Their coach was Seth Chafetz at the time, and the choreographer for this dance was Liz Punsalan.