You are misunderstanding what a board does.
Projects contain issues.
A filter returns a list of issues, often with a simple "project = X", but they can be much more complex, with things like "project in (x, y, z)" or "issues assigned to me" or "project in (x, y) and issue type = bug".
A board is a view of a filter.
So, when you create a board from a project or filter, it is always going to show you the issues in that project or filter. Because it's a view of those issues.
Also, a board does not belong to a project. You can't "create a board in a project" because they don't go into projects.
You can do the "new blank board" though - create a new board that uses a filter that returns no issues.
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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