In OR you can OC most anywhere without a permit, but you cannot conceal. OR does not recognize anyone elses CPL, only their own, so no CC.
There are some places (like Portland and Astoria) that say, without a permit, you cannot OC loaded. There is a funny little twitch to these loaded OC bans. It appears the OR legislature (and the local laws) say, you cannot OC load "without a permit from a government agency." Origon state law, and the local laws based on this state law, do not specify what a "governmental agency" is, but it is NOT specified as only an Oregon governmental agency.
Therefore: We have speculated that a WA permit would cover you for loaded OC in those places with loaded OC Bans because of this "governmental agency" wording...
No-one has ever seen a court case of this, but if you look in the treads here you will find one thread on a WA man that OC'd in Astoria, being arrested for loaded OC. No charges were ever filed, he got his weapon back, etc...anyway...read the thread.