In
CompoPack-KingGen/CPVANILLAKINGGEN13PREFABLIST.txt at main · stallionsden/CompoPack-KingGen (github.com) I see these duplicated POI lines (line number : prefab name):
72:blueberryfield_sm
130:cornfield_lg
131:cornfield_med
132:cornfield_sm
369

otatofield_sm
538:water_tower_01
539:water_tower_02
540:water_tower_03
630:blueberryfield_sm
631:cornfield_lg
632:cornfield_med
633:cornfield_sm
634

otatofield_sm
635:water_tower_01
636:water_tower_02
637:water_tower_03
Edit: but darkness falls already includes most of compo pack's POIs (and edited versions of them, for balance reasons). Anyways, I was not looking to combine compo pack with darkness falls -- I was just using the compo pack poi list because it was the only example of a poi list that I had found.
Anyways... now I understand that the "Generate custom POIs list" feature will build the thing for me. So that's good. (And I checked the poislist.txt generated by kinggen -- it doesn't have any duplicated pois.)
On the other hand, it seems to contain 844 pois, and the prefabs directory has 893 pois. Kinggen has tossed all the POIs whose names begin with two 'A' letters. Like AAA_quonset_01 ... or maybe those are not really POIs? It's odd...