Lets clarify.
Vcenter is an application to manage ESXi hosts. when you two vCenter does it mean, you have installed two vCenter application in your 4.1 environment.
If yes, On first server, Install primary SSO and First vCenter and then you can install VUM, web client and collector application on the same server. Similarly install the secondary SSO and vCenter and corresponding applications on second server.
If you have only one vCenter Application installed on 4.1, then you can have the configuration specified mentioned in your query itself.