CR XIr2 and CR 2008 in BOE XI 3.1

I am looking for a document detailing how to install CR XIr2 and CR 2008 on same client. I need both of these apps to be able to post to BOE XI 3.1 is this possible? How will I be able to tell once a report is published if it is a r2 or a 2008 version.

Thanks

Bryan