Is Doubleday the same as Quality Paperback Book Club?

During July Crazy Credits, I completed the Doubleday Book Club offer. Received credit and posted the offer on the Crazy Credits thread - I just went back and looked at that post and it definitely read Doubleday Book Club . But now in my account, the exact same credit with the same ID number reads Quality Paperback Book Club.
Everything I received from the company appears to be from Doubleday Book Club.
I don't want to complete the Quality Paperback Book Club offer right now, as my account looks like I've already done it. Did this happen to anyone else?

I think they're run by the same company and you can only sign up for one or the other. SR has both offers, but can only run one at a time. If you're already a member of Doubleday, I wouldn't sign up for QPB.

Thank you!