I am not sure at all
but some items have also some stats written in orange
Regular gear dropped from the mobs after the upgrade (it didn't affected my old gear) shows the old regular yellow stats(+hp/mp/sp), and these orange which may differ.
For example in map3(AoL) i got 3 different muffles for pagan/orc like this:
2. +1 REC
3.+ 3 INT. +500 mp
all of them have also the "old" normal bonuses (+xxhp, +xxmp), the same for al the 3.
My hypothesis is that enchanting the item will add also the orange stats.
I'm going to try and make some test as soon as i find something for archer.
EDIT: add the ss:ok, they're not the mufflers but it's the same!
dropped in map3 from sealakers, same yelow stats(like the NPC ones), different orange stats(ok, VERY different, the first looks not very good for a caster!)