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The only difference between CAN actual boost and voltage fed to the DME is a conversion formula that must be the same in all N54 software versions.
So, in the considered scenario, the only significant variance is introduced by the piggyback voltage output.
The Procede is able to verify through the CAN variable if the voltage it is actually feeding to the DME is coherent with the 'designed' value and, in case, adjust the gains applied to the MAP readings.
So, in this case, the correction is performed in order to solve a hardware problem related to piggyback quality control... and it's unnecessary in case all JB3 (or V4) are created equal.
P.S.
5% of variance can be accepted between gauges (pressure sensors), but IMHO is quite strange in case of electronic devices such as piggybacks.
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