HCX Replication Assisted vMotion works the same in VMware Cloud on AWS SDDCs as it does in on-premises or private cloud environments.
The service must be selected in the Compute Profile of both the source and destination sites.
The service must be activated in the Service Mesh deployed for the respective source and destination Compute Profiles.
To migrate virtual machines using Replication Assisted vMotion, see Migrating Virtual Machines.