I just compared the swords from my recently acquired sets 7949 and 7950 with older swords from the previous Castle line. If you don't hold the both of them right next to each other you wouldn't think the new swords were different from the older ones. In fact there seems to be a difference, as the new swords are slightly more steel-blueish than the former ones, and the older swords seem to have a more pearly hilt. But that could as well be an unintentional variation due to production issues.
I guess, the person who did the inventories on most of the new Kingdom sets didn't even think of identifying the swords' colour as different from the older swords, I sure wouldn't. That's why the swords in these sets are called "pearl grey" instead of "flat silver". Only the person who did the inventory on 7949 seems to have suspected a difference.
This is just the sort of nonsense up with which I will not put.