cluster key on two different system

Hello,

I have SAP BI 4.1 SP06 on Windows 2008 R2 server.

There two systems PROD and QAS.

PROD has one server. server11 with cluster key=clusterkey1

QAS has one servers, server21 with cluster key=clusterkey1

It is working fine so far with same cluster key.

Now I have a task to add one node (server12 to PROD and server22 to QAS) to each system to increase the capacity.

I am assuming that I will add a new server to the existing system and when it asks a cluster key I enter the above key.

Is it going to be any issue if the cluster key is same.

They are different server and system.

Please advice.

Regards,

SS