Assuming you compare RAW files, comparing raw color rendition on two cameras makes no sense. Every sensor has a different response to color and light, and none is perfectly linear. In real life (JPGs files, photo editing softwares), the RAW values are adjusted through a calibration profile, which corrects the color deviations of the sensor, based on curves or lookup tables, to match real colors. No sensor (in cameras as in industry) is ready to work as-is, you always have to calibrate it. (Full disclosure : I'm a trained metrologist).
Assuming you compare JPEGs files, again using the same settings makes no sense (different sensors, different integrated softwares, different response). Usually, the L value of the white patch of a color chart is between 96 and 98. Just make an exposure bracketing with both cameras and retain only the files whose white patches are the closest to the expected value. In other words, compare the pictures wich have the same white level, thus the same actual exposure.
BUUUT… what you will compare will NOT be the actual color accuracy of the sensors but the accuracy of the color profiles used to calibrate the sensors, inside or outside the camera. So again, I don't know why you would need to compare the color accuracy of two cameras, but it sounds useless to me since you can make your own profiles (it's just software) and since the sensor raw data is always to be adjusted anyway.
Some other specifications might be more relevant to compare, such as the noise level in RGB channels or the color depth. More details on DXO : https://www.dxomark.com/About/Sensor-scores/Use-Case-Scores