Heathcliff and the Catillac Cats

The Cat and the Pauper [Heathcliff] (2x11)

Air date: Sep 16, 1985

Heathcliff switches places with a rich cat, a look-alike named Beatcliff. They both adjust to their new lives, until Heathcliff meets Beatcliff's fiancé Agnes, and he skips out on their wedding.