This patcher makes a patch for NPCs that reflects your entire load order:
NPCs added by mods will be furrified
Vanilla NCPs altered by other mods will have their changes carried forward. So, for example, if you're running with an AI Overhaul mod it makes changes to the NPCs; then YA changes them again, and you lose all the AI changes. This patch consolidates the appearance changes from YA with the other changes from earlier in your load order.
Any changes to races are merge