We can't know, actually. It all depends on which types of update packages Motorola creates (and VZW pushes).
Back in the Droid 1 days, there would be 2 seperate update files. One was a differential update designed to be pushed out to devices running the latest offical OS; this update was generally quite small in size but would only work if you had the latest official firmware installed. On the other hand, there would be a "full update", technically designed for those that might not be running the latest OS on their device. This update was generally quite large in size, but contained the entire OS.