If you want to dive in further here is a video that address the issue of what you linked : https://youtu.be/eTz96M1AkVo?t=400 There are many such online.
At the end of the day there is only one Quran with 114 chapters it's start with surat Al-Fatiha and ends with the last surat An-Nas.
If you want to learn more about Islam. I recommend the One Message Foundation channel : https://www.youtube.com/c/OneMessageFoundation/videos
Finally, I want to invite you to become a muslim. Meaning, I invite you to submit your will to the one and only creator the same one who sent Moses, Jesus and Mohammed (Peace be upon them all) so that you may attain eternal paradise and avoid hell. In the end you make your choice and I'm only here as a conveyor of the message.
Nope. Although the Quran is very well preserved for such an old document, there are multiple variants. Muslims often claim it's perfectly preserved, but it's just not. See for example: https://www.youtube.com/watch?v=aYwwX5lc_ww (start 8 minutes in).