Thoses numbers are old.
Healers is a must to get your belt and bracer PvE for more stats. The healing buff from Expertise get diminishing returns really fast.
DPS wise is different. I was doing more damage with PvE belt and Bracer with my sage DPS instead of the PvP one.
Yes you do slightly more damage, but you also take more damage.
Getting power crystals instead of expertise is the only good swap because it's 1:1.