I believe that this approach will create a couple of issues, because the destination CMA is on the same MDS as the source one. If you migrate without any changes, then IP address of the CMA will stay the same together with all certificates. Also, I believe that there will be some difficulties with rule UIDs.
Nadezda Zuka
Do you plan to delete the source domain?
Do you need to copy only objects and rules of one policy package?
Do you have VSX gateways?
Do you have some more tricky and difficult configurations in the policy, than just for example firewall rules, NAT, VPN?
I'm thinking about cp_merge tool - sk33751. It is officially not supported with MDS/CMA, but you can export objects and rules from a CMA for sure. Then you can import it to a virtual machine, do some tricks with it and then try cp_merge again for new domain or import "migrate export" from the virtual machine.