Dear all,
I wrote to SCN Support and they told me the next:
Unfortunately at this time it is not possible to consolidate SCN accounts, link them or transfer points, badges or content from one account to another. Our identity management system is complex and we are working to develop a functionality to consolidate accounts, but since it is complex work it is taking more time than originally expected. I am sorry for the inconvenience this is causing to you. At the moment what you can do is create a new account and start from scratch with no content and no points, and once the functionality to merge accounts is available you will be able to benefit from it.
So it is not possible. 
Thanks to all of you.
Best regards,
Martina