They are, but that's because the relative "burn rate" is actually a broad representation that includes the effects of the actual burn rate, the shape of the burning curve, and the total energy content of the powder on pressure. These factors all rolled into one by comparing peak pressures developed by loading the developer's choice of charge weight for all the powders in the chart developer's choice of cartridge using his choice of bullet. Norma's 2013 manual describes it in some detail, pointing out that if one chart or portion of the chart is developed with, say, a 308 Winchester using a 147-grain bullet, but another developer uses a 7×57 with a different bullet and charge charge weight, the order of the different powders listed will not be the same because they will be running at different pressures and with different effort to get the bullet moving. What surprised me here is that both charts came from Hodgdon, whom I assumed would use the same cartridge and bullet, but apparently not.