Why is the protein levels in the nutritional tables the same for ROGERS All Purpose Flours and ROGERS Bread Flours?

The protein levels in the nutritional tables are reported in whole numbers as 4g/30g of flour.  In fact, ROGERS All purpose is 3.8 g/30 g and ROGERS Bread flour is 4.2/30 g.  Both numbers round to 4g/30g of flour.