again, look at the epa website, there are two different calibrations between 2018 and 2019.ECU's ran on the dyno's showed EXACT same fuel curve and rates across the entire RPM range. That has been discussed by the companies that dyno'd both. Those same companies found the reeds were the difference in HP.
if you were to pull the reeds from 100 different 2018 sleds and then do the same for 100 different 2019 sleds, the statistical variation of petal thickness would be zero. if dyno tuners are seeing a difference with reed petal thickness, it is simply by chance. and if you test enough, it would even out.