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It’s quite a common theory/headcannon that Crowley doesn’t remember his time as an angle before he fell. If this is true, they would both have different a first memory of eachother, meaning their first impression differ. I think this would explain the assumption that both Aziraphale and Crowley make to metatrons offer.
Aziraphale’s first memory is of the happy Angel whose happily created the galaxy and asks questions about why it has to end, which gives him the impression that Crowley would be happy to be a Angel again, wants to ‘reform’ heaven and prevent Armageddon 2.0, therefore would want to go back.
Whereas Crowley’s first memory (as far as he knows) is of the Angel who betrayed heaven to help Adam and Eve by giving them the fire sword, and over time continues to betray heaven, leaving the impression that he isn’t very loyal to heaven and likes humans, therefore wouldn’t accept it.
Then over their 6000 years on Earth, they both betrayed their sides. Giving Aziraphale the idea that Crowley liked heaven and Crowley the idea that Aziraphale didn’t.