Can this be done with two installs of WHMCS and one install of SolusVM

Hi everybody!
I want to have a second VPS company in addition to UnmanagedServers.NET that will provide fully managed Xen VPS. Now, I want to use the same install of SolusVM. Obviously I will make a second node group for the Xen servers in the SolusVM.
My concern is: what if there is a customer that orders one VPS from UnmanagedServers.NET and one VPS from BetterVPS? how will it handle that?
Thanks!