Computor pics of the OEM and Gillespie version of same are never close enough to compare.
Computer generated colors will do fine when comparison to another computer generated sample are being used.
You can take two brand new from the factory M38A1's in 1953 and stand them in front of the Willys factory, one in the shade and the other in the sum and you will see two different colors. You can then place them side by side in the sun and look at one from the front and the other from the rear and you will see two different colors. Two different people will see two different colors under the exact same conditions. You can take a Wednesday morning painted M38A1 on Sep 15 1953 and sit it along side a Thursday afternoon painted M38A1 A Sep 15, 1953 and see a slight difference. As mentioned above just slightly different amounts of hardener/accelerator will throw off two different shades of the same color.
When two colors differ as much as 2430 and 24087 it is fairly easy, no matter what system you use to tell them apart.
GSA Federal Color Standards program has a very detailed scientific way to view a finish to determine how well it matches the Federal paint chip.
Those levels of analism aren't necessary here. The last two paint swaths shown are close enough to those official colors that you will have no problem picking the correct one.