To spell it out further: if the two processed outputs from different accounts are bit-by-bit identical then it is impossible to tell them apart. Ie they cannot

To spell it out further: if the two processed outputs from different accounts are bit-by-bit identical then it is impossible to tell them apart. Ie they cannot contain identifying data to you. They might still contain data that groups those multiple accounts together though. Eg everyone in X university gets the same watermark.