Вещь вещи рознь, человек человеку рознь

People vary very much in character, habits, manners and inclinations. See Всякий молодец на свой образец (B), И сорока в одно перо не родится (И), Люди разные бывают (Л)

Cf: All bread is not baked in one oven (Am., Br.). Every fish is not a sturgeon (Am.). Every man in his own way (Am.). Every man in his way (Am., Br.). Every man is exceptional (Br.). It takes all kinds of people to make the world (Am.). It takes all sorts to make a world (Br.). There are no two alike (Am.). There may be blue and better blue (Br.). You can't put the same shoe on every foot (Am.)