Hello Amit
It is possible to do a client copy between SAP systems running on different OS and DB.
You can check that in the point 5 of this SAP note.
For a client copy you need to make sure that the source and target are having the same patch level for BASIS and other components(including add-ons).
I would check with SAP if this is recommended as migration of production clients using client copy method is not generally a good practice.
Regards
RB