AD7793 thermocouple multiplexing

I need to connect 32 thermocouples to the AD7793 and plan to use a few analog multiplexers such as the ADG707.  Is it acceptable to connect the thermocouples directly to the MUX and then have the RC filter between the MUX and the AD7793?  CN66 shows 1k resistors and 10nF capacitors plus a 100nF across the differential inputs.  Can the capacitance values be increased for better filtering?  I suspect the resistors should not be made much larger because the bias voltage is generated inside the AD7793.

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