Muslims firmly believe that the Quarn, unlike the Bilble, hasn't been manipulated whatsoever and it's the words of God himself directly given to Muhammad. Though I've heard that there were some minor differences in versions found in different geographical locations.

https://www.dailymail.co.uk/news/article-7824541/China-rewrite-Bible-Quran-reflect-socialist-values.html

Of course.

I don't know enough about the Quran, but the Bible absolutely has, over the centuries there have been committees and whatnot about what should and shouldn't be included in it