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Similar reason why these three photos look like slightly different colors: image sensor type, quality, and postprocessing.
Older images, less accurate. Especially if the type of image a system is capturing is not meant to be consistent with the human eye.
Even then, postprocessing is inevitable.
As the white/gold versus blue/black dress debate showed, our perception of color is heavily influenced by context, and is more than just a simple algorithm of which rods and cone cells were activated while viewing an image.