To the best of my knowledge, once you import an Excel spreadsheet of VPP codes into Configurator those codes can only be used on that computer. You can install or remove apps from iPads and reallocate apps on that computer but can't take the codes out of Configurator to use them in another instance of Configurator or in an MDM for redistribution.
The exception would be if you wanted to migrate from redemption codes to managed distribution in which case unredeemed codes or codes redeemed through Apple Configurator could be changed to managed distribution licenses. See http://support.apple.com/kb/HT6015 for details on this process.
Hope this helps!