That would be quite a large undertaking. I'm not even sure if the damage scales are compatible.
Is there anything in particular you are interested in?
I do have a 700kb settings.txt addon to improve the population modifiers for economics and build rate.
http://imagemodserver.mine.nu/OldPir...pmodifiers.zip
Just cut and paste into the P&N settings.txt (don't forget to remove the old pop modifiers)