Creature Blueprint XP Awards

I searched for this because I know it’s been discussed before but darned if I can find it.
I want to modify the difficulty of selected creatures. I already have copies of the blueprints to modify.
I’m looking two fields, Challenge Rating and Designer XP Mod.
Do I need to modify both? How do they interact?

You don’t need to modify them if you simply want to increase toughness and strength of the selected creatures. These fields are only important for scripting purposes. The challenge rating is used mostly by AI and random encounter systems. As for “Designer XP Mod”: read this post. In short: it just switches off automatic XP gaining so that module designers can manually control the XP progress for that creature.

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Thanks!