I think there is a subtle difference.
The cause could earn someone a PhD.
Novak hates Israel. He hates it with the passion of the most virulent Arab. He hates it like those Neturei Karta Jews. On a scale of 10, Novak's hatred of Israel is a 12.
But, raw anti Semitism is not readily visible in what he writes about Israel. Lies, propaganda is all there, but you are hard put to find raw hatred of Jews- or maybe I've just missed it.
On the other hand, Buchanan is all about anti Semitism. No one believes that he takes the Arab side for love of Arabs. It's all a deep demented hatred of Jews from Buchanan.
You may be right.