Well, I'm no expert....just started pin collecting w/DD on our 2/29 cruise, but my understanding is that they just need to say Disney on the back.
We really enjoyed going through the pin trading album each night and bought all of the pins only avail. on CC....those are our favorites!
You are probably more prepared than we were, but we didn't know much about it. We didn't know to ask if the CM's had any "special" pins or "lanyard" pins until we got off the boat and arrived at WDW. And we didn't know that those CM's wearing green lanyards can only trade with children....they usually have the best pins!
Have fun!