Who’s who in Duckburg? Scrooge and arch-nemesis Magica De Spell trade souls and fortunes in Lars Jensen’s “Body Swap!” Next, it’s Donald’s turn to possess Scrooge’s brain in Paul Halas’ “Guilty As Charged” — and to become a star author in Michael T. Gilbert’s “Write Thinking!” Finally, in Carl Barks’ “Tricky Experiment,” the Beagle Boys capture Scrooge’s new round money bin... or do they?