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It's a single book with all stories (except crossover) and numerous edits. Fill out plotholes, adds jokes, changes things that didn't work, etc.
The first four story arcs (The Duck Knight Returns, Crisis on Infinite Darkwings, FOWL Disposition, and Campaign Carnage) got reworked into the Definitively Dangerous Edition, while Dangerous Currency was exiled from continuity; the Joe Books series (Starting with Orange is the New Purple) take place after Campaign Carnage.
I found this on Amazon, called "Disney Darkwing Duck: Orange Is the New Purple: Comics Collection". Is this the same thing, or something else?
That's a paperback edition of issues 1-4 of the Joe Books run (the three Orange is the New Purple issues, and the Gnatmare issue).
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