令 and 冷 are different characters. They only have the same reading, from their common 音符 (onpu), 令. Other characters with the same onpu: 零, 玲, 怜, etc. All these

令 and 冷 are different characters. They only have the same reading, from their common 音符 (onpu), 令. Other characters with the same onpu: 零, 玲, 怜, etc. All these characters have different meanings.