I've found a couple of listings of archaeocete teeth frags from Harleyville, South Carolina on a fossil seller. I know that Basilosaurus cetoides, Zygorhiza kochii, and Dorudon serratus all exist in this area, with a couple of examples of all three having been found there (now in Charleston Museum collection). However, is there a way to differentiate between them when it comes to teeth, specifically incisors? Some images of the listings are below.
First tooth measures 2.6 inches. Second tooth measures 2.2 inches, but is a frag so I imagine that it may be much bigger if restored. Third tooth measures 3.75 inches.