Can not load a config file - CKEditor 4

Hello,
I use ckeditor 4 and I appeal to the config file with jquery in this way.

$( '#html_message' ).ckeditor( function() { customConfig : '/back_office/includes/editeur_texte/ckeditor/config-news.js' });

For a specific form, I create a second config file "config-news.js", but when I call with Jquery is always the toolbar config.js is loaded. And I do not know why!
I tested with a classic appeal "CKEDITOR.replace" and the file "config-news.js" is loaded.
To maintain unity in my code I have preferred to call the file with Jquery.
How would you solve this problem?

Thank you for your help