The first 2 look like standard greys. I don't know a whole lot about the different color variations, but below is a picture of one of our rescues the day we brought her home..she kind of looks to be the same color as your third picture. I wasn't sure if she was a cinnimon or if her coat was discolored from bad diet.
Here she is 3 months later...turns out it was diet related.
Is the third glider yours too? Is she on a different diet?