How to display something conditionally in template file depending on the current path
Drupal core's template suggestions allow for naming page templates based on the path of the page. So, theoretically, if you had www.mysite.com/registration-a, then you could use the the page template name page--registration-a.tpl.php and so forth.

However, if this does not work, you can create a page preprocess function in your theme or module that adds some template suggestions based on the path.  For example:

function THEME_NAME_preprocess_page(&amp;$variables) {

 if($arg[0] == 'registration-a'){
 $variables['theme_hook_suggestions'][] =  'page__registration_a';
 }

 if($arg[0] == 'registration-b'){
 $variables['theme_hook_suggestions'][] =  'page__registration_b';
 }

}


this would allow you to use page--registration-a.tpl.php and page--registration-b.tpl.php, etc.

For reference, $arg is an array that contains the different parts of a URL, so if you had the path mysite.com/registration/customer, then $arg[0] would be 'registration' and $arg[1] would be 'customer'.