sorry bout the spellin
Answers:
King snakes are notorious for being cannibalistic (meaning that they will eat their own kind).
They are solitary snakes and it is not recommended to keep king snakes with other snakes.
No California kingsnakes and other kingsnakes will kill and eat other snakes. That's why they have the name KINGsnake. If you put another snake in with them you will end up with one very fat California kingsnake.
You have to be VERY careful with Kingsnakes since they're cannibalistic! I assume you know this and thus the question. I have heard stories where people were trying to breed them and their 2 snakes would magically become 1 fat snake! I don't recommend it unless you are dead set on breeding, in which case you'd better confer with an experienced herpetologist.
You could try it and maybe be okay as long as you kept them both well fed (always feeding in separate cages though). I, personally, don't think it's worth it. If you want another snake, get a separate "vivarium" ;) and just do it that way.
NO!..Kingsnakes are like the garbage disposals of the reptile world. They eat snakes and lizards in the wild, they will eat all kinds of small fuzzie animals. I told one guy once maybe like a big tortoise or box turtle, but the turtle might be living in fear with him.
Kingsnakes are known to eat snakes that are the same size as themselves so please don't try to mix them.
No-they are cannibalistic.