[1] It is. This online calculator will produce the same results as cn_fast_hash (keccak-1600): https://leventozturk.com/engineering/sha3/
Wikipedia's page on SHA3 used to have the keccak variant listed in examples too. TWPTB decided we didn't need those anymore (you can find it in the history section): https://en.wikipedia.org/wiki/SHA-3
Historical page for your viewing pleasure: https://en.wikipedia.org/w/index.php?title=SHA-3&oldid=676252215#Examples_of_SHA-3_and_Keccak_variants