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The worst-case scenario for a single pair of mismatched 1% resistors is about 0.17dB. This could compound across a circuit but that's statistically unlikely.
The most likely cause of your level mismatch (assuming it's in the range of a dB or two) is uncalibrated DAC and ADC channels.
But let's find out how big the mismatch is. If it's 6dB, we'll have a different assessment for you.
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