Hello Yasirsdt, Here is the link to Dell Unity: Replication Technologies, and if you look at appendix C it list replication support across platforms. [URL]
Is it possible to replicate EMC UnityXT series with Unity Devices (for exmaple Uniity 300 with Unity 380XT or 480XT) in sync or async mode?  what are the prerequisites and requirements for it?
UnityXT Replication with Unity