Mine looks like RichardM after 190 miles and 11 days. Was tight when I took delivery. Leather stretching...
I will be surprised if dealer gets authorization to replace your bottom leather cover. And assuming they do the leather will be from a different lot and may be slightly different visually.
Also do you really want dealer techs taking your seat apart on your brand new car to replace the bottom cushion? Knowing full well that within weeks the end result will be the same?
Just trying to help.