I have two different needs that requires 2 different boards but using the same cards.

I want a journey map where I will map my features and steps in a journey map. This will be for me as a Product owner. I will then create releases to map my expected deliveries. That I can already do.

Then for my development team, I would like to map the same cards but by Epic. I have multiple teams that "owns" epics and they will want during planning to map my stories from my journey board into an Epic Map where they would create "releases" mapped to sprints, for them to plan the work to do and see if they are aligned with what I plan to deliver to customers.

So 2 boards using the same white cards, but with different yellow and blue cards (different first and second level) and different position in the map.

I can do this if I map my stories to Jira: Have 2 boards that imports same project from Jira and creates "same" cards.

So the requirement is to have 2 instances of the same "shared" card, so that if I change title in one board, the other card in the other board automatically changes because it is an instance of the same card.

Similar to the "clone/shadow/replica" idea posted before, but instead of a duplicate in the same board, allow the full cards in a board to be "shared".

Maybe something like when I clone a board, I get the option to really do a duplicate board or just create a linked board both sharing the same cards. Because if I add one card to my linked board, I want the other board to also have it.