This just an example of what I am trying to achieve.

Using the standard RGB pinwheel effect on a mega tree and have the arms change one by one to the Twinkle effect. So it would Change the red arm then the green, so on...

I thought I could use the Chroma key layer but it appears that I can not use the layer twice for two different colours.
Am I doing something wrong or can you only use one layer of the chroma key?