Saturday was the "Am" day and Sunday the "Pro" day at Iron Hill in Delaware. Everyone played the same lay out the first round Saturday and Sunday so you can compare the "Am" scores to the "Pro" scores.
As you can see here
a 68 shot in the first round on Saturday was rated 968 while a 68 shot on Sunday
in the first round on the same layout was rated a 989. The weather conditions were the same. Isn't a 68 a 68?