How can I compare differences between a configuration (assembly) and it's derived configuration?

As the Title says,

I want to know what the differences are (e.g. what is suppressed in one and resolved in another) between a configuration and a derived configuration (or between 2 configurations in general).

I know I can do that for parts and look at the difference in features, but also here i do not find how to do it between configurations. I always have to browse to a location, but since all configurations are in 1 file, I have to choose the same file. Then SW says he cannot compare when i select 2 times the same file.

Grtz

Arno

SolidworksAssemblies