How to move / copy some VMDKs?

I have a VM with 2 VMDKs on the new SAN and 2 virtual RDM disks referring to data on the old SAN.

I want to have all data in VMDKs on the new SAN.

One way to do it is to do a Datastore migration to a (new) datastore on teh new SAN. That will pull in all the data from the virtual RDM disks into a new VMDK on the new SAN.

But, that wil also copy / move the data from the 2 VMDKs that are allready on the new SAN.

Is there a simple option to just simply pull in the 2 RDM disks to the directory on the new SAN where the other data is now?

My environment is a vCenter 5.5 with ESXi 5.5 hosts

Datastores are VMFS5