Hi Leo, It really depends on how large the mismatch is. I would just to a simple spot check with a meter to make sure they are not magnitudes of difference. If there are both 1% resistors with the same value it should be fine. Next, I would look in to increasing your filters cutoff frequency. Designing for a cutoff frequency 10x+ the sampling frequency is a general guideline, and with a -3dB point of 3978Hz, your signal is being attenuated (although slightly) well before that. Try increasing the cutoff point to at least ~6kHz and see if that helps.
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