Create a parameter and call it colorswapper of type integer
Value 1 Text as Measure x
Value 2 Text as Measure y
Create a CF call it colorswapper
WHEN 1 then [Measure x]
WHEN 2 then [Measure y]
Place on color shelf
Maybe I am missing something, but what you've shown will change the fill colors of the map. I want to change the color of the Labels - (i.e., the black percentages in the attached image).
Place it on the labels shelf
Putting in on the labels shelf make the labels be the colorswapper value. I want to the values of the labels to stay what they are, but the color of each label to be different, depending on the value of colorswapper.