Migrating from 2008 to 2012 Folder Redirection

Basics, hopefully will explain it fully:

2008 GPO for Folder Redirection: Storage location \\server_old\store$\%username%\my documents

2012 GPO for Folder Redirection: Storage location \\server_new\store$\%username%\documents

Is there a way to get 2012 to utilize my documents so we dont have the network moving the docs to a new folder called documents. 

I want to use robocopy to copy the share over, but it does me no good if then the new gpo copies all the user data back across the network to a new folder that it creates.

Thanks