Yes, WordPress uses the same template for the post page, but when you use any class of Perma-link, “the loop” will show just one post.
The loop is the bit of code that use WordPress for show the posts (and their comments, if you request a permalink), and the search’s results
You put the include after <?php trackback_rdf(); ?>
and before <?php endforeach; else: ?>
.
And the include is…:
<?php include(ABSPATH . 'wp-comments.php'); ?>
That’s all.
(If you need more help, just ask =))