DiffPDF 2.1.3 finds only two tiny (if weird) differences in the appearance of the two versions of the books ( https://yurichev.com/writings/AL4B-EN.pdf and https://beginners.re/RE4B-EN.pdf ) besides the title, author and build date: two page references at pages 1075 and 1078. Since both sites appear to be owned by the book's author this is most likely just a change that has not yet been pushed to github (or mentioned…
Yes. Explanation: https://yurichev.com/blog/UAL/