Candy Crush change branding

Mustana

One of our clients has a requirement where they want to place their ads, which are basically not ads but full branding.

So to give you an example, let's say Candy Crush needs to have all the look and feel of our client branding.

Now, can anyone confirm if this is possible? And if yes, what will be your cost, and is doing this possible for all the games developed by Kings?