Discord doesn't just share an actor with Q: he's an explicit reference to Star Trek's trickster god. They were even going to look for people with a good DeLancie impression before the man himself offered his services.
For beings like Discord and Q, it's very easy for the relationship to change from "derivation" to "identity".
For beings like Discord and Q, it's very easy for the relationship to change from "derivation" to "identity".