Multiple Google Analytics codes for individual pages

Sure, that’s possible. Are you including the GA-code anywhere on your site today? If not, you can add the following code to your theme’s functions.php-file:

add_action('wp_head', 'add_google_analytics');

function add_google_analytics(){
    global $post; 

    if (is_page('page1')){ ?>
        <!-- Analytics code #1 -->
    <?php } else if (is_page('page2')) { ?>
        <!-- Analytics code #2 -->
    <?php } else { ?>
        <!-- Analytics code #3 -->
    <?php }
 }