Mark,
It seems that what you don't realize is that they are in the same dune valley. If you could see behind the trees behind the green in each picture, you would see the other green. Therefore, they are twins in uniqueness.
The next row of dunes creates another valley, but at least twice as wide. In that valley, there are greens at either end instead of two greens in the middle like the ones in the first two pictures. The wider valley is one long fairway with a portion shared between the two holes going in opposite directions, because you tee off from opposite dune tops. If you hit it bad enough, you could nail someone teeing off on the tee on the other side going in the opposite direction.