Why is the Book of Qu'ran so similar to the BoM?

There arent any variants to the Quran, since it was completed 1400 years ago. Every quran in history 1000 years ago (those found in museums) will match up exactly syllable for syllable with the Qurans today... they are in every part of the world, and every one is the same, thats why no one has ever found any changes in it.. otherwise we'd all know about it by now (like we do with the bible, king james version etc).. grow some common sense, and stop spreading propaganda