there is not information about the input impedance of INA240 in the datasheet.
Can you provide information about it?
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the common mode input resistance is not constant but depnds on the common mode input voltage according to figures 7-14 and 7-15 of datasheet. The input resistance can be estimated by calculating the gardient of these curves:
R = dU_common_mode / dI_input_bias
which is about
R = (70 - 10)V / (200 - 80)µA = 500k
for common mode input voltages >10V.
As Kai mentioned, the common-mode input resistance at each input pin is variable depending upon what the VCM is and can be easily deduced using Figure 7-14 and 7-15.
There is also a typical 6kΩ (+/-20%) differential input resistance in between IN+ and IN- pins.