Working with VM replication sets (Windows) : VMware vSphere snapshot replication sets : Prerequisites for VMware vSphere snapshot replication
 
Prerequisites for VMware vSphere snapshot replication
For successful VM replication, the version of the virtual machines to be replicated must be supported in both the source server and destination server.
When creating a virtual machine in the source environment to be replicated, ensure that the version of that virtual machine is also supported in the destination environment.