Question on Hilts and Pommels for swords..

Ok I have this gold winged sword its stats are
15-22 dmg
+13% dmg while health is over 50%
+1 to swordsmanship

ok I have a pommel that gives 20 to health and a zealous hilt

anyways whenever I try to put them on it askes me it will erase the old upgrades

now im wondering what will pommel erase and what will hilt erase? thanks

What's the full name of the sword? Something Winged Sword of Something?
I would think it's something like xx Winged Sword of Swordsmanship? Anyways, If you use a pommel it'll erase the +1 Swordsmanship, and if you use the zealous it'll (I think) erase the +13% dmg over 50% health.