First, I would like to point out that I'm not real familiar with either of those morphs.
Just going by my own "first impression" it seems to me that the coloration is different in the top 2 from the bottom 2. Now...that could be due to lighting or where the focus of the camera was.
If I look at each of them at a time, they all seem similar. But if I look at all of them at the same time, it seems to me that the bottom two have a light pinkish hue to their "white". And the contrast seems a bit more "snappy" on the top two, while the bottom two it seems just a tad "softer".
But again, that could be due to how the light hit on top / bottom of the picture.
Well, I know this isn't helpful at all. But I do have to say, all 4 of them are Beauties !! Look so healthy and vibrant with great color and contrast!!