The original set (Green) was published in 2010.
The second set (Red) was published in 2011.
The second set has completely re-organized and reduced the number of chapters to the point it is almost impossible to compare the two book sets. The second version also has additional material, although I could not tell you what is new.
The second (red) set also shipped with two CDs, which were not in the original (green) set.
The CD's came in individual cases, but there are two CD pockets to store them in the back of the volume 1. I think that the CD's are the additional content.
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