single tpl.php file for two nodes?
You can use template_proprecess_page hook to achieve this as shown below:

function &lt;THEME_NAME&gt;_preprocess_page(&amp;$vars) {
    if (arg(0) == 'node' &amp;&amp; in_array(arg(1), array(9, 11))) {           
        $vars['theme_hook_suggestion'][] = 'page__node__9and11'; //For page--node--9and11.tpl.php
    }
}


Add above code to template.php of your theme &amp; clear cache.