WordPress: find out which pages are using the same template as this one

other_pages_using_template.php

<?php
$template = get_page_template_slug();
$args = array(
    'post_type'  => 'page', 
    'meta_query' => array( 
        array(
            'key'   => '_wp_page_template', 
            'value' => $template
        )
    )
);
$posts_array = get_posts($args);
var_dump($posts_array);