$mod_name = get_post_meta($post->ID, 'Name', $single = true);
if($mod_name !== '') {  
$query_string = "  
SELECT *  
FROM $wpdb->posts  
LEFT JOIN $wpdb->postmeta ON ($wpdb->posts.ID = $wpdb->postmeta.post_id)
WHERE $wpdb->postmeta.meta_key = 'Name'
AND $wpdb->posts.ID != $post->ID
AND $wpdb->postmeta.meta_value = '$mod_name'
AND $wpdb->posts.post_status = 'publish'  
AND $wpdb->posts.post_type = 'post'
ORDER BY $wpdb->posts.post_name ASC";
$series_posts = $wpdb->get_results($query_string, OBJECT);
if ($series_posts):