sidebar.php modification

I have tried some plugins to modify which sidebar that is displayed, but I had problems with making them work. Therefore I want to code it. I read https://kriesi.at/support/topic/sidebar-for-search-results-2/. For my post type “ordliste”, I plan to add single-ordliste.php and modifided the code at the bottom to get_sidebar('Ordliste'); to display the widget “Ordliste”. I also duplicated sidebar.php and named it ordliste-sidebar.php. I guessed that the only thing I need to modify is:

  // general blog sidebars
            if ($avia_config['currently_viewing'] == 'blog' && dynamic_sidebar('Ordliste') ) : $default_sidebar = false; endif;

Is that correct? Actually, it should not be necessary to run through a loop to find which sidebar to display for this blog category as I always want to display the same sidebar, but not sure how to modify this. It is more enjoyable to fix it through coding than by a plugin as I also can learn something. Your help would be much appreciated!