Also, BDS, BASC and any other tend to have differing "padding". Still the same information in there, just more "fluff".
Whoever you "register with" will provide/prefer you to use their issue. Again, once you annotate it the information becomes more relevant to your personal view.
DMQ administer the qualification, they do not themselves "teach" it. Many organisations and commercial companies are registered to "teach/qualify".
Stan