They are the same content, just different covers. Over the years, several labels were use which can be confusing, so we have now standardized these as "Commentary Workbook."
As workbooks run out of stock and are re-printed, they will be updated with new covers. Many old covers may say "Comprehensive Workbook" instead of "Commentary Workbook."
Our Workbooks can be found here.
See also: What is the difference between a Workbook and a Handbook?