At first glance, one has a gold clasp, one silver.
The one from PP has rounder pearls so I would prefer those-but you may not mind so much. That's a preference thing.
I'm guessing that the overstock are not hand knotted on silk, or the quality of the silk isn't as good as those from PP. Don't know for sure though. I remember reading somewhere about this aspect. I didn't pay enough attention.
The PP strand is definitely higher quality IMO.