MSP430FR5043: TIDM-02003 EVM430-FR6043 TS5A9411DCKR

Part Number: MSP430FR5043
Other Parts Discussed in Thread: TIDM-02003

For the gas metering scheme, I would like to know about the replacement of R74 and R43 in the circuit design of TIDM-02003 MCU050A_Analog-Front-End.SchDoc, as well as the function of the circuit composed of C35, C36, R42, R45 and R46, and what treatment is done to the electrical signal? The same function of the circuit composed of C43, C45, R65, R66, R67, how to deal with the electrical signal?