Why are there so many more ISBT 128 product codes than Codabar codes?
The reason for so many more codes is that ISBT 128 codes are more specific than Codabar codes. The ISBT 128 codes differentiate between characteristics such as the nominal collection volumes, the system integrity (open vs. closed), etc. Therefore, there is not a one to one ratio between ISBT 128 and Codabar codes.