Nuka-Cherry was originally the product of Merle Haverston, branded as Merle's Very Cherry Soda, prior to being acquired by the Nuka-Cola Corporation. After acquiring the patent, Nuka-Cola Corp. rebranded it as Nuka-Cherry, and changed the flavor profile to that of a Nuka-Cola and cherry mixture along with adding coloring to boost its visual appeal to consumers.
Sometime before the Great War, The Nuka-Cola Corporation introduced their own cherry-flavored soft drink, branded simply as Nuka-Cola Cherry. However, unlike the Nuka-Cherry beverages distributed in the Boston area, this other cherry-flavored soda proved highly unsuccessful.
Nuka-Cherry shares the same look as the other bottles of Nuka-Cola but adds a bright red color to it and a cherry flavoring. According to the Fallout Tactics lore, Nuka-Cherry, or Cherry Nuka-Cola, was very unpopular and a failure of a soft drink due to its taste. This is contradicted by loading screens describing it as having "instant success."
Compared to the standard Nuka-Cola, Nuka Cherry can be viewed as an upgrade: providing better healing and a larger Action Point boost while giving the same amount of Radiation.
The following is based on unverified behind the scenes information and has not been confirmed by canon sources.
The story of its introduction, rejection and replacement by Classic Nuka-Cola mimics that of the real-life New Coke campaign. In reality however, New Coke initially received generally positive reactions in terms of taste, but the iconic status of the old formula produced a strong backlash reaction that pressured executives into changing it back.
End of information based on unverified behind the scenes information.