Some of your close-up pictures are a bit blurry, and the seller's pictures are not close enough. I would like to compare the finish on the patent leather between both pumps.
The other details look fine so far, save the imbalanced proportioning between both of the black pumps from the rear view. You can see that the curvey serpent part is done differently on both pumps. I;m not sure if this is an indication of being a fake, since every once in a while, a crafter isn't careful, but it is certainly making me doubt the authenticity.
The soles of both shoes ahould have darkened with wear since they are made of a tanned hide similar, but I can't tell if there is water-damage or a patina on the soles of the black shoes (it looks more like dirt and blackening to me). If the bottom is wearing like a natural hide, then your shoes should be authentic.
I want to add that differences between similar pairs of shoes does not mean that one of them are fake. There is sometimes variation among products, and it may relate to the time of manufacture.
