Like already stated on previous comment, the versions cannot be different (mixed), see: Prerequisites and Best Practices for Site Recovery Manager Server Installation
Install the appropriate version of Platform Services Controller and vCenter Server on both sites. You cannot mix Site Recovery Manager, Platform Services Controller, or vCenter Server versions across sites. For information about compatibility between vCenter Server and Site Recovery Manager versions, seevCenter Server Requirements in the Compatibility Matrixes for vCenter Site Recovery Manager 6.0 at https://www.vmware.com/support/srm/srm-compat-matrix-6-0.html.