Assume I have two identical spheres. I add a rig to the first sphere, then I deform second sphere in sculpt mode without adding new polygons or vertexes. I duplicate the rig and I want to connect this secod rig with my second sphere that the rig could animate this deformed sphere exatly like another rig animates first sphere. Another words I need to transfer weights from the first sphere to the second sphere. But 'weight transfer' option only works with objects that connected to the same rig. So I have two spheres and two rigs.
How can I manage that?