Trying to add a second SharePoint 2013

We run a CRM 2011 Environment with a SharePoint (Version 2013 w/o SP1) for archieving files for opportunities and companies. Now, we want to add a second SharePoint Volume (Version 2013 with SP1) for marketing campaigns. The installation of the list component works fine, but when we try to add the path of the new SharePoint, CRM answers that the list component isn't installed.

Does CRM 2011 only works with one SharePoint? Or only with an unmixed pair of versions?

Thank you in advance for your Support.