I have purchased dark, medium and light stonewashed shorts in this specific style.  The only variation has been the color.  However, the sizing, as indicated by various reviewers, has varied significantly.  These light stonewashed shorts (I purchased 2 at the same time) were both too small compared to the fits for the dark and medium colors.  I have tended to find this sizing variations on jeans from Levi's and Lee.  Be cautious when buying through mail order and note the return policies carefully.  as much as I prefer mail order shopping, there are still good reasons to drive to the local mall when there's a sale and try on the clothes you want before purchasing.  (this is not true for some brand names which I have found over many years to be extremely reliable in sizing).

with that being said, these shorts are very classic and not easy to find in regular department stores.  so if the shorts fit, they are great.  The ability to shop for various colors and sizes on Amazon beats the time spent trying to find them locally (at least in my location).  finally, it seems that with continued wear, they do "stretch" a bit and fit better.