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According to the Lexus web site GS RWD = 36.4 ft. and ES350 = 36.7 ft.
According to my owners manuals (we have both a GS460 and an ES350) the turning radius is 34.1 feet on the GS460 (which is equipped with active steering) and 36.7 feet on the ES350.
That difference seems right to me. Also it is consistent with the fact that I found it much easier to maneuver the GS around our parking lot than the 330i whose turning radius is 36.1.
KBB data is consistent with my owners manuals. See here, click on detailed spec.