I understand that Jira typically treats the rightmost column as the definitive "Complete" state. And two columns to the left of my rightmost column are marked as done.

However, my team’s workflow requires two different columns to be treated as fully closed: "Release" and "Deferred." Since both states mean the task is finished from a sprint perspective, we need Jira to treat issues in both columns as "Completed" so they don't roll over to the next sprint.
I have two specific questions:
1. Is it possible to assign the "Completed" checklist logic to multiple columns? How can I configure the Board Settings so that Deferred tasks are also excluded from rollover and included in "Completed" reporting metrics?
2. What is the functional difference between the two columns (with green checks) and the rightmost one?'