These specific images may be recreations but typically it’s the same artwork with more color because the adapter can do more. Or shading colors or things like that.
Different adapters and video standards had different dithering techniques, so when presented with an image with more colors than capable for display they will dither down, how you do this dithering can dramatically effect the image.
Kind of crazy that they had to do the art again for each video card type. Like 3x the work.
I went looking and found this article about the art.
These specific images may be recreations but typically it’s the same artwork with more color because the adapter can do more. Or shading colors or things like that.
Different adapters and video standards had different dithering techniques, so when presented with an image with more colors than capable for display they will dither down, how you do this dithering can dramatically effect the image.