I'd say it's either:
- Variation between lighting in the photos
- Slight variation between shade of washes
So my question to you is: did you actually see these at the Nordstrom store and they look different? The pictures look similar enough to me that I would say they are easily the same wash, though, without defect.
EDIT:
After closer examination is the detailing on the pocket actually different or just different shade? There was an issue similar with Thanaz 8B9.. on the Diesel web store photo the jeans didn't have the line across the back pocket, but in reality every pair did.