Yes, the big sample could be any of the 28 colors and different on every card. If you saw my card, you would see that the big one is "Buff". In the first picture, it could be a toss-up as to which one matches, the "Buff" or the one below it, which is "Sand". The second picture is obvious with the big "Buff" sample on top of the "Sand".
No one lives forever, the trick is creating something that will.