Same seedling, most of the differences in the pictures are due to age of each flower when it was photographed. The third picture, in particular, is of a fairly old flower only a few hours away from folding up. The ground color, for lack of a better term, starts to fade towards the end of the flower's life.
Perhaps I shouldn't have included that picture in the post, but I actually prefer the aged flowers a bit. The ground color becomes "pinker" and less mauve. The veining stays much the same, though, so the contrast between the veins and the rest of the fall increases .