restoring clients after homogeneous copy

Hi...

I have a QAS system with three clients (100, 120 and 200).

I have a PRD system with just the client 100.

I was asked to perform an homogeneous copy from PRD to QAS, but to make sure clients 120 and 200 are not destroyed.

My question is:

Would a client export (SCC8) with profile SAP_RECO solve my problem?

I would first export both clients (120 and 200) with SAP_RECO, using the QAS system as the target, perform the copy, and then import the clients again through STMS. Would this work? Or is there any other way of doing this?

thanks

Antonio