Boards are not containers for issues, you can't "move" issues between them because they don't hold them. Projects hold issues.
Boards select issues via the board filter. If you want a new board to show the same issues as an existing board, give it the same filter as the first board. You can "close" or delete, or whatever the old board and it won't touch the issues, as they're just being selected by it.
I have multiple projects that use variations of the same base workflow. The variations depend on the requirements of the project or issue type. The variations mostly come in the form of new statuses ...
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