Drupal node templates which apply to more than one content type. Possible?
Implement a preprocess function that adds a template suggestion.

Assuming your theme is called EXAMPLETHEME, your content types are content_type_1 and content_type_2 and the template file is called node--example.tpl_php, add the following function to the file template.php of your theme:

function EXAMPLETHEME_preprocess_node(&amp;$variables) {
  $node = $variables['node'];
  if ($node-&gt;type == 'content_type_1' || $node-&gt;type == 'content_type_2') {
    $variables['theme_hook_suggestion'] = 'node__example';
  }
}