In my recent revision of Revelation, I have updated the footnotes to show the both the NA28 and the NA29 readings when they are different.
https://bibletranslation.ws/revelation-updated/
You can download the new PDF here: https://bibletranslation.ws/trans/revwgrk.pdf
Or buy the printed edition of Revelation here: https://www.amazon.com/dp/1958612103
