https://www.cbr.com/10-tv-pilots-that-are-completely-different-from-the-rest-of-the-show/

TV shows often grow and change from season to season, and occasionally that results in pilots that feel much different from the rest of the series.

Rugrats All Grown Up feels different from the series. The series was a little bit too edgy and Chuckle sounded too much like Bart Simpson