Lighter color for a secondary same action button?

I have a add button (with a green color) in the main level of my web app. This button also appears in other levels of my app. My CEO asked me if it would be a good idea to change the color to a lighter green every time I go deep in the levels. I have the feeling the green color should never change because it is an action button, and it could mislead users. I mean, if an add button is green, it should has the same green in the whole web app.

What do you think?