This information applies to version(s): 1, 2, 3, 4, 5, 6
When you open a RAW image from a camera the color rendering of that camera is automatically applied. If you select the same color rendering in the panel it won't make any change. Camera body color renderings are made to be able to apply the color rendering of another camera to your images. This way you can harmonize a set of images from different cameras, for example.