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To be fair, the "originals" look to my eyes as original unprocessed scans. I doubt the original kodachromes had such flat look, rather the opposite. Scanning has always been the weak point in digitizing film, it rarely reproduces the richness and pop of the "originals" as seen through a light box or projected.
I think the 'originals' are actually dupes of the originals... you'll notice an orange digital-looking three digit number along the border of many of these images, implying relatively modern duplication.
Some of these, such as the landscapes, do look like Kodachrome to me. It was never a super high 'pop' film like Velvia, though it was high in contrast. Personally, I believe all of these images would have been 'better' rendered with a quality digital camera, when it comes to colour quality, as opposed to sheer resolution. The Kodachrome appeal for some, might be that they've seen the look in filters applied by Instagram and Hipstamatic, lending familiarity to the truly vintage images. Not saying it's the case for those posting here, but for the general public...