i have owned many chanel bags in the past (I switched to mainly Hermes, but I did buy an so balck mini reissue chevron last summer, so i have seen recent bags too

I do think it is the nature of rhe leather. IMO, it’s possible with a natural skin to have a slight difference in texture that perhaps caused a slightly uneven stitch (though I cannot really see it myself). I do think it’s a gorgeous bag and you should wear and enjoy. JMO
I would not get it replaced. Your bag is stunning and there Is always the chance the replacement may not be better. JMO though.
@Sp123, I would ask the leather professional what they recommend. It would have to be dyed inside and out, and I’m assuming they would have to remove the chain and replace or redye that as well. If I found a really great deal on a thrifted bag, I might take the gamble, but there is always the risk you may not like the outcome. Please keep us updated! Would be interested to see an after pic if you go down that route