https://www.ebay.com/itm/1912-T207-B...sl79IyGiFAAziQ
Take a look at the side by side photos in this listing. There does appear to be color differences, although it may be caused by the scanner. Some of the PSA card holders seem to be frosted and the black background doesn't come through and a few of the holders seem to be clear and the black background shows through, and these appear to be the ones with the darker colors in the box.
I wish I had a dozen raw cards to hold in my hand.