I am not sure how to answer that because if a boat has a fin keel "the other parameters" usually would not be "identical" (to a boat with a long keel). But more to the point in my experience the slick left by a boat has some impact on motion comfort and less of an impact on safety in breaking waves, so that in my mind simply making a larger slick is not directly translatable into saying the boat is more safe in breaking waves.
It probably goes without saying that boats behave as a system of a whole. Keel type is but one aspect of that whole and since the term fin keel really describes a broad spectrum of keel shapes and sizes and each behave differently, I would not say that generically fin keel boats are either safer or more dangerous than longer keel boats when lying abeam to large waves.
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Curmudgeon at Large- and rhinestone in the rough, sailing my Farr 11.6 on the Chesapeake Bay