As for difference between the two builds, the new one is arriving as OxygenOS 5.0.1 and contains a couple of new fixes, presumably for those issues that caused the cancellation of the first build.
The new fixes in question are for bugs related to third party camera application and network issues for European operators. Also, the update isn't compatible with units having unlocked bootloader, so you need to re-lock the bootloader, or find some way to flash the update manually.
5.0 version is not detecting dual Sims....mostly needs to switch off and on...this issue should get resolved...
Wasn't it app / technical data that was being collected? Are there any reputable sources to indicate that users' PII was being collected?
finally oneplus its about time