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What is the difference between a Ding Dong and a King Don?

When Hostess introduced Ding Dongs in 1967, the advertising campaign included a ringing bell: hence the name Ding Dongs. However, the eastern United States Hostess opted to package the cakes as King Dons to avoid confusion with a competitor's product. Hostess consolidated the King Don and Ding Dong name in 1987, packaging the cakes as Ding Dongs in all regions. Six months later, Hostess decided to go back to using the King Don name in the eastern U.S., again, to avoid confusion with a competing product. But, today the issue has been put to rest and only Ding Dongs are sold nationwide.

--Hostess Website