What changed between Akira in the magazine and in the books?
It is tempting to treat a collected volume as the magazine chapters in a binding. For Akira, the record says otherwise, three times over. The clearest early witness is the English edition: Epic Comics translated from the collected volumes rather than the magazine, and its publication suffered significant delays toward the end because Otomo was still retouching the artwork for those volumes. The color Akira of the early 1990s was late, in part, because its author would not stop revising the black-and-white one.
The second witness is Akira Club (1995), which exists largely to print what the books displaced: the chapters’ title pages as they ran in Young Magazine, and the test designs for the covers. Paratext is where revision shows first, and Otomo archived it himself.