When monitors are set side by side, the color temperatures may vary with each monitor. Some monitors does not arrive from the factory with perfectly matched colors. You can see this when using multiple monitors or a video daisy chain setup.
First you must do a factory reset on all affected displays. This brings all settings back to factory defaults. If this does not help, then adjust individual RGB settings.
Adjust the individual RGB color settings to get the monitors to match.
The following is an example of the before-and-after pictures when adjusting the RGB color temperature settings.
Before adjusting the RGB temperature settings (Figure 3) All three monitors in default mode with color set to standard color mode (after conducting factory reset)
Figure 3
After adjusting the RGB temperature settings (Figure 4) All three monitors have the same color temperature settings.
Figure 4
There will be times where it is not possible to 100% match each monitor.