Had the Uthmanic codices differences in them?

Salamun aleikum, I have a question, regarding the compilation of the Quran. My question is about the differences in the Uthmanic codices, which were sent to different cities to unite the Ummah on this topic. So, I read two statements on this topic: 1. In Al-Azamis book „The History of the Quranic Text“, he quotes on page 99 (from Abu Ubaid, Fada‘il and ad-Dani, al-Muqni), that there are variations of no more than 40 characters throughout the 6 mushafs, concerning only one letter, with an exception of the exclusion of a „he“ in one verse. 2. Somewhere else, where I am going to post the link, there is given another source, where it states that in verse 9:100 the word „min“ is only there in the Makkan Mushaf. So there would be another word, which is either included or excluded. https://www.islamweb.net/en/fatwa/259588/facts-about-the-writing-of-the-mus-haf So my question, are these two complementary or one of them wrong or did I understood something comepletely wrong? So ist would be great, if someone clarifies this point, because this topic really confused me. May Allah protect Us from going to a wrong path and protect our heart from the whisper of the Shaitan.