Hi @mattrobinson
Hmm… The easiest way would be to write a PHP script to transfer the values from the old post the new post. The code would be something like this:
$field_key = '<field_key>'; // replace this with the actual field key
$old_post_id = <old_post_id>; // replace this with old post id
$new_post_id = <new_post_id>; // replace with new post id
// first get value from the old post
$value = get_field($field_key, $old_post_id);
update_field($field_key, $value, $new_post_id);
Hope this helps 🙂