The 2nd does not look like my buff orphington chick. It looks more like my new hampshire chick which has a black tipped tail, and the reddish orange body and black strip on its beak. But I'm a newbie to chickens. Just sharing.
I agree - the second one is not a buff orpington. very cute, but not a buff. (we have 11 buffs and one buff roo in the henhouse, so that's all I see everyday and we raised seven of the hens from the time they were a week and two weeks old so I saw them as chicks.)
here is what my buffs looked like as chicks. the smaller ones are one week old, the bigger ones are two weeks old and shedding their baby fluff for real feathers: