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I should be able to use psychic powers from Chaos Daemons on Chaos Space Marine units, right? For example "Slaanesh - Hysterical frenzy" could be cast upon a unit of Warp Talons, as they have both the <Daemon> and (of my choosing) <Slaanesh> keywords.

Yes. All these powers and abilities work as written in regard to kewywords.
The only exception is codex daemon stratagems, which can only be use on Faction daemon units.

Of course, and thanks !