nThe only way to get Shared Topology is to use either SpaceClaim or DesignModeler. If you have one of those, they can open a many types of files, then you can create a Multibody part and Share Topology.nIf you don't want to do that or don't have those licenses, then you can imprint the larger face with the outline of the smaller face to get identical faces, then use Mesh Controls to get a congruent mesh on both faces, and finally use Mesh Merge. That ends up being equivalent to Shared Topology, but is more work.n