Only in Case, your former Flow Ratio (FR) was 1,00. If not, what I think is: you need to multiply the old FR with the calculated FR to get the correct FR.
But in both cases, the actual wall thickness is not 2 times 0.4 becouse of the overlap.
See:
https://forum.bambulab.com/t/flow-rate-calibration-confusing-results/25776/2
L.G.
Frank