Unsure what your question is but I'll try.
PR/DR counters don't really have anything to do with spell stacking.
NPCs have the same number of slots available as a PC -- 15.
There can only be one spell line active at once on an NPC.
Two different Druids cannot both land Swarming Death, it will just overwrite depending on level.
A player of your class would be able to give you more detailed information of what active DoT's you could have on a NPC that do not have stacking issues.
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