Are There Different Versions Of Quran?
1. No. 2. No. 3. Yes, and sometimes a slight variation in the meaning whose implication may be significant, for example, two variant readings of the verse of ablution, imply either washing feet or wiping a wet hand on feet. For details follow the link below
If you are asking about the variant readings of Quran , then please also watch the discussion in Response to 23 Questions Series on this topic: Discussion 71280