To me they look different colors. And one has a gap where the hinges are. The other one does not. I think it's not the same chair as the one in the auction.
That's one of the things I meant in my earlier post about wear-and-tear too. The one in the auction picture looks very pristine to me... essentially it looks awfully clean to have been dragged all over Alberta and set up outside in the grass/ dirt, etc.
Maybe like wardrobe (multiple versions of the same costume)... there are multiple chairs provided? I don't really know how all of that works on a film set.
But, I love, love, love that photo from the set, it just makes me smile.