It's better to think of boards as a view of a set of issues. Whatever you do on a board is acting on the underlying issues.
So, if you delete an issue while in one board, it's deleted the issue. Other boards have no issue to show any more. You're not "deleting from a board", or "moving from one board to another", you are just deleting or moving issues between projects.
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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