If you have the same project with the same issue type in use - this isn't possible unfortunately.
Boards are just a visual representation of the project's issues, and even if they don't share any stories it's not the board that controls the workflows. You can have one workflow per issue type per project.
Your options here are:
Learn how to use two new reports for next-gen projects in Jira Cloud: Cumulative flow diagram and Sprint burndown chart. Ivan Teong, Product Manager, Jira Software, demos the Cumulative ...
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