Aric's Expansion gives instructions for making a mod compatible.
"To make Aric’s Expansion compatible with another mod: 1) Compare the files that the two mods alter from the base game (generally under “scripts”). Note any that both mods touch. 2) Find the alterations Aric’s Expansion made to the script. These are always between the “#—-Added by Expansion—-#” and the end marked by #—-Expansion End—-#”. 3) Copy and paste each section from Aric’s Expansion into the mod’s files. 4) Modify any “#Changed By Expansion#” parts of the script to match Aric’s Mod (usually by placing # in front of the changed part) 5) Ensure the mod (or patch of a separate patch was created instead) loads after Aric’s Expansion (which should override Aric’s with the patched mods files)."