Transferring shared cards to new group (Ad Hoc group -> Directory Group)

We've implemented SSO to make it easier to manage groups (we have directory department groups) and I want to migrate or share all the cards / pages available to the old group to the new group. We have Active Directory groups that have been created and I want to share all the content shared with the previous group to the new group and delete the old group. Is there a way to do this?