Yeah, I agree with dartnet. The nature of each setting being its own makes the data incompatible with one another. That is one thing that I do when I download a data set. I copy the file, then modify it to be compatible with my existing settings. To give you an idea I can share my personal data set. I still have to "clean up" Deadlands (and add the stuff from Stone and a Hard Place) and ETU, and I am slowly working on Hellfrost.
https://dl.dropbox.com/s/ozcaq531yno4khn/updates.xml
My "cleaning" is making sure that things are accurate and mesh with my existing data and rules. Sometimes I "steal" edges or hindrances, strip them from the source, and make them more generic. I have it set to have one setting at a time, but some things can be shared between two or more settings. I hate duplicating things that are the same.