The only difference between the T2080 and the T2080E CPUs is that the SEC engine is enabled on the T2080E.
See T2080 Datasheet, chapter 7.1 Part numbering nomenclature. https://www.nxp.com/webapp/Download?colCode=T2080.
> Does having or not having Security Engine affect performance?
Please clarify what performance you mean. If your software dosn't use SEC the performance should be the same both for "E" and non-"E" devices.
> Where can I find the difference between T2080 revision A and B?
The difference between T2080 revision A and B can be found in the T2080 Errata document.