This is my iPhone 5S (left) compared to my iPhone 7 (right). Both at maximum brightness and auto brightness off. Picture taken with my D500 in RAW format. A WhiBal gray card is included to set the appropriate white balance in Lightroom. I measured both screens with my ColorMunki Photo and Argyll. The result was 7686K for iPhone 5 vs 6945K for iPhone 7, both higher than the expected D75 and D65 calibrations.
Next I tried to increase the color temperature of the iPhone 7 to match the iPhone 5S using the color tint correction. I managed to get 7607K with this setting
And this is what the corrected iPhone 7 looks vs the iPhone 5C. Not much of a difference compared to the uncorrected one.