No. Your fact pattern does not reflect any conflict and you cannot assert a conflict on the other side of the counsel table because you don't have "standing" to do so.
The lawyer represents the Board in one case and Board members in the other? That does not sound like a conflict of interest.
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In any event, if there is a conflict of interest, the clients of the attorney can waive the conflict. You, as the opposing party, do not have standing to assert the conflict or to prevent waiver.
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