But to trainerunlimited, the horse the OP is reffering to is the gray - on the right in the first picture. (this has been pointed out to you already though)
Also, like you said in another post "...That doesn't even look like the same horse to me. The socks go up to different lengths on the two horses, lol. I wasn't aware that could change with age as well...", yes this can change with age as well.
Take this little guy for example, first pictures are of him as a baby and the last is him a few days ago (just coming 4). As you can notice he WAS NOT a gray baby at all, and he only had three white stockings and on solid leg, now he has four very defined stockings. (although the front right will probably only continue to gray out)
Crazy how they can trick you.
p.s. We did think he would gray out though, because like someone said "Gray will cover any color" (his mother is a flea bitten gray and his father is sorrel)