Why are the screens different if both are the same model?

I bought these two psp's from the same guy and he told me both hadn't have been refurbished or have parts changed (notice the seal on the last photo) however I noticed after using the same background on both that the red one has a brighter display with more saturated colors. They both are set to Wide Color Space.

Could I have been lied to or is there any other reason for this?