WSS and MOSS in same farm for Reporting Services?

One of my clients is implementing a Reporting Services solution with SharePoint integration mode. They were keen to find out whether they can have mix of WSS and MOSS in the same farm environment.

A SharePoint farm consists of multiple servers that all use the same version of the SharePoint product or technology. The instance of the SharePoint product or technology that you install on the report server must be the same version as the other nodes in the farm. If the server farm uses Windows SharePoint Services 3.0, you must install Windows SharePoint Services 3 on the report server computer. If the server farm uses Microsoft Office SharePoint Portal Server, you must install an Office SharePoint Portal Server Web front-end on the report server computer. You cannot have a combination of Windows SharePoint Services 3.0 and Office SharePoint Server 2007 in the same server farm.

http://msdn2.microsoft.com/en-us/library/aa905869.aspx