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It seems to me that both terms should be avoided, as they both seem to come from the "old way" (scrumspeak) of doing things. Scrum vocabulary uses "Potentially Shippable Product." In my experience, organizations that have not achieved a continuous integration type of maturity may employ a "Release Scrum" to clean up loose ends and move to an actual release, but this is not a valid end-state for scrum.
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