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  • What you need to do is create an acf/save_post filter

    In this filter
    1) Check that it’s the right post type
    2) See if the checkbox is checked for this post
    3) If the checkbox is checked, do a query for posts that also have the checkbox checked and exclude the current post.
    4) If any posts are returned in the query then update the field uncheck it

    Sorry I can’t provide any code, but what looks like 4 simple steps would take me quite some time to code.