We are implementing a process for controlling Office 365 click-to-Run updates so that our application testers can verify that the updates have no adverse effects on their applications. 

We started distributing the April update on April 14th and the update version at the time was 15.0.4711.1002.  We are also using the group policy registry keys to control the version.  Today after hours of troubleshooting why we are now getting errors when PCs are trying to update to that version I discover that there is no longer a version 15.0.4711.1002 and has been replaced by 15.0.4711.1003.  I cant find anywhere why this has been updated or what changes were made so I don't know if this now has to be retested by our testing group.   Just wondering is this a minor change and if so what was it?