The thing important is these 4 resistors of 22k (r1,r2,r3,r4) have the values mached as well as possible:
r1 should be mached only with r2 , and r3 should be mached only with r4
So the temperature drift isn't important if these 4 resistors of 22K are equal between them (r1 ----> r2 and r3 ----> r4) (same type, same manufacturer, etc..) , because they have the same resistor value vs temperature, they cange their value with the temperature at same manner.
These resistor can be 5% of tollerance but selected with tollerance of 0.1% max.
The sbalancer's CMMR input depend by these tollerances. With 0.1% of tollerance the CMMR is of 60 dB at 1khz, and with 1% tollerance the CMMR is 40 dB.
Regarding the input caps (c1, c2, c3, c4), they could be oscon type (I council them), but they should be for audio or for switching power supply, even if the can be general purpose types but with low ESR.
Their tollerance isn't so important forCMMR, because they assume an impedance value near to zero at audio signal frequencies, it's more important their ESR values than their tollerance. However, for best CMMR value at very low frequencies it's melior using 47uF value for these caps.