What happens if I don't calibrate the 32MHz clock on the ADPD105?

We are currently doing measurements to compare the signal to noise ratios (SNR) of the PPG signals that we record with various setups. While doing so, we noticed that although our current software implementation does perform a calibration of the slow 32kHz clock, it does NOT perform a calibration of the fast 32MHz clock. Now we are wondering if this negatively influences the quality of the measured signals, and if so, to what extend it influences the signal quality. Can you please clarify this for us?