I don't think they have quite the reputation as common kings but I would imagine they are dietary generalist to a large degree. Over the last few years I have had several regurgitate freshly eaten meals while taking pics. One was an adult that threw up an adult mouse, another was a subadult snake that threw up a vole that was huge in comparison. And the other was a neonate that regurgitated a broadhead skink that was not much smaller than it. They can certainly pack down good sized prey items.