Directional Light with Default Material have large brightness differences between Mobile and Desktop

I am surprised to see differences in the Detail Lighting, Lighting Only, and Unlit views between Shader Model 5 and High End Mobile. There shouldn’t be visual changes especially in Unlit unless the default values are different between Shader Model 5 and Mobile shaders, though I doubt this is the case as I piped in a black color into the material and I still got the same results. Is it possible that sRGB isn’t handled the same between Shader Model 5 and Mobile shaders?

Shader Model 5 Detail Lighting

High End Mobile Detail Lighting