Occupation Impacts Employment doesn't total up to same value as Industry Employment impacts

After running an analysis I observe that the Total Employment impacts shown under Results > Employment > Industries by Impact > Total Impact Employment, doesn't total out to be the same value shown under Results > Occupation > Occupation Impacts Table > Wage and Salary Employment. The same can be observed for the Direct, Indirect and Induced Employment impacts. Shouldn't the split of Employment data across Industries and Occupation Codes be the same? If not, then what explains the difference.