I recently migrated from a free Google account to a Google Apps account.
I now have most of my app purchases assigned to firstname.lastname@example.org and some recent app purchases assigned to email@example.com.
To the best of my knowledge it's not possible to transfer those purchases from firstname.lastname@example.org to email@example.com.
I'm using a Samsung Galaxy S III (GT-I9305) with CyanogenMod 10.1.3-i9305 and Titanium Backup Pro.
I reset my phone and configured it with firstname.lastname@example.org.
I downloaded all the apps purchased with this account and performed a backup with Titanium Backup.
I reset my phone again and configure it with email@example.com and restore my apps from the backup.
Titanium Backup alerted me that my Android ID had changed, so I reverted back to my previous Android ID.
When I try to update apps purchased with firstname.lastname@example.org, I get a 403 error in Google Play.
Is it possible to update apps via Google Play if they were purchased with a different account and restored onto your phone?