For all of these years I had been under the impression that Duck Tales comics and The Barks Duckverse were two entirely separate continuities, containing many overlapping characters but also some aspects unique to each of the two worlds. Earth-D and Earth DT, let's say.
A recent thread on The Fethry Society, however, set me straight that there are several examples of characters created specifically for Duck Tales making the leap into the mainline Donald Duck comics universe:
While Launchpad McQuack shares space with Donald and Daisy in "New Year's Daze," by Stefan Printz-Paulson and Vicar, as seen in Bear Mountain Tales.
So there you have it, Bubba the Cave Duck fans, your favorite character counts as an honorary Duckburgian! Surely it's only a matter of time before the Darkwing/ Gizmoduck/ PKNA teamup that all the Tumblr fanart people have been clamoring for becomes official.