Diet Coke
Diet Coke does not use a modified form of the Coca-Cola recipe, but instead an entirely different formula. The controversial New Coke, introduced in 1985, used a version of the Diet Coke recipe that contained high fructose corn syrup and had a slightly different balance of ingredients. In 2004, Coca-Cola introduced Coca-Cola C2, which it claims tastes much closer to Coca-Cola but contains half the carbohydrates. In 2005, the company introduced Coca-Cola Zero (replaced by "Coca-Cola Zero Sugar" in 2017), a sugar-free variation of regular Coca-Cola.
Cool-A-Coo
As part of development of the new recipe, a few prototypes were created and tasted by Dodgers Stadium employees that had eaten the original Cool-A-Coo. In their opinion, the prototypes — with less sweet and more dense vanilla ice cream — did not taste like the original Cool-A-Coo. The perfection of the new recipe also required a missing ingredient in the oatmeal cookies in the form of cinnamon.