Previous ( /g/1931327/4f82153770/ ) seems to be original. Resolution is the same, but ( /g/1931327/4f82153770/ ) images are 8-bit grayscale, while this is full blown 24-bit colour. Given that images are grayscale, and ( /g/1931327/4f82153770/ ) uploader managed to provide the source for that version, this one looks like a recompressed copy to me.