GREAT INPUT!
Ted, your Chase and Baker are the classic "light " vs. "dark" examples contrasted next to each other...
there are a few that pop up that are borderline...I can usually differentiate them because of my scrap eye....
to answer the question, I don't think any of them would be bleached( some lighter ones would actually smell like bleach).....i'm a little nuts and whiff all my cards

...... id probably taste them if I could

....but good thought
I'm thinking:
the two different colors are two complete different printings spaced some time apart for some reason(this is only a theory of mine).. 2 complete different bulk ink supplies....
or a stretched blue by adding white to extend the blue , causing a "baby" blue color...STEVE WHERE ARE YOU??
Craig Wright?
Jimmy??
TC??