move a virtual machine from one vCenter to another vCenter

I have the following problem: There two separate vCenters (ESXi). They cannot see each other or communicate in any way. I can create a Clone of a VM in vCenter1 but then I want to move that Clone in vCenter2. Is there a way that I can copy the Cloned VM (files) on an external HDD and move them in the other vCenter?

I've figure it out the solution to my problem:

• Step 1: from within the vSphere client, while connected to vCenter1, select the VM and then from "File" menu select "Export"->"Export OVF Template" (Note: make sure the VM is Powered Off otherwise this feature is not available - it will be gray). This action will allow you to save on your machine/laptop the VM (as an .vmdk, .ovf and a .mf file).
• Step 2: Connect to the vCenter2 with your vSphere client and from "File" menu select "Deploy OVF Template..." and then select the location where the VM was saved in the previous step.

That was all!
Thanks!