Isn’t the problem with your example that a completely color blind person cannot differentiate the wavelength, but they can differentiate the intensity of light. I’m also mostly assuming here, that our light cones are sensitive to certain ranges of frequency and that is how we can differentiate different wavelengths.

The scientific and philosophical question is if we can prove that each person perceive those combination of signals the same way. The subjective experience.

Unless of course the color blindness is a “software” issue rather than a “hardware” issue.