The idea that one can compare the overall scores on the Golfweek Classic list versus the Modern list and make some determinations is erroneous.
Raters are asked to compare and rate courses only against their peers, so when one gives a modern course a 10, for instance, they are saying that it should be among the top 5 MODERN courses....not the top 5 of ALL courses.
Following that thinking down the line, by definition, there is NO actual comparison between the two lists and attempts to quantitatively do so are faulty because of the way that raters are asked to score.
For instance, Merion is not rated against Whistling Straits...one might rate Merion a "9" on the Classic List (meaning a ranking of 6-15), and Whistling a "10" on the Modern list (meaning a ranking of 1-5), yet believe that Merion is a better golf course overall.
Hope this helps.