

You hve been marbled.
Now though the tail is a little different, this is why I think it is possible for them to be the same fish..
White face on both, dark eye patch on both
But look behind the head on the seller pic..
There is a dark like that starts right at the gill plate, and travels up and over.
Your pic has the same darker line
Then right behind the edge of the gill plate, where the darker line starts, there is a horizontal bar looking patch visible on both pictures.
Above that on both pics, though not as clear in the seller pic are a couple stray grizzle like scales.
On the body, right below, and to the right of the dorsal is a patch that is the same on both pictures. It is either a line, or a darker, bluish white patch, before the darker blue appears.
Not too far back form the darker blue, right under the dorsal is the same lighter patch.
Looking at the anal fin, to the rear of it, near the body is a dark patch on both pictures. And there is the same oddly shaped dark patch that comes up from the point of the anal fin
There are some differences, but marble is like an appaloosa, there is no way that two fish are going to have the same exact markings.
The color difference is probably due to lighting and even possibly photoediting.
But there are so many similarities in the markings, that I have to say that I am pretty sure they are the same fish.