Barbara-Maggie inverses

The Twilight Zone 5.13 Ring-a-Ding Girl stars Maggie McNamara as a character called Barbara but is known by her nickname Bunny.

This episode came on December 27 1963 and it was the fifth birthday of a real-life Barbara, Barbara Crampton and inversely to Maggie McNamara playing a character called Barbara, Barbara Crampton later played a character called Maggie in The Bold and the Beautiful.