Did Diet Mountain Dew and Pepsi have different names before they were called Diet Mountain Dew and Pepsi ?
Diet Mountain Dew:  It was formerly known as "Sugar-Free Mountain Dew" until 1986, when it was given its current name. Pepsi:  Originally created and developed in 1893 and introduced as Brad's Drink, it was renamed as Pepsi-Cola on August 28, 1898, and then as Pepsi in 1961.
yes