I think that these have actually been indexed by ancestry as it doesn't mention FamilySearch in the information, but I'm not certain. In any case, don't forget that the images are available free on FamilySearch but ancestry's index may be more complete, though probably less accurate. The Genealogist also has an index and images available.
Norfolk Baptisms, Marriages and Burials 1535-1812
Norfolk Baptisms 1813-1915
Norfolk Marriages and Banns 1754-1940
Norfolk Burials 1813-1990