@NAHIDA ROBERT welcome to the community! i think you're close - it's a bit annoying, but i thik what you'll have to do is create a custom field on Board A that basically mirrors due date (call it mirrorDate, or whatever you'd like to call it), and then have a rule that says when a date is set on a card, set custom field mirrorDate to {cardduedate}.
And then you can create another rule that says when the custom field mirrorDate is set, , find the card titled {cardname} in that other board, and then i think you can use the set due date to date in custom field mirrorDate.... or maybe {trigger%MirrorDate} I'm actually not sure the exact syntax.
You might want to just use something like Unito or Placker to keep cards in sync between boards
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