Jimmy Doug
If you know what's good for you ...
No, the chain is tougher than any other chain. They're all made from the same carbon steel. The cassette cannot last forever, no matter at what point you change the chain. Eventually it wears out.
What I mean is, normally it's not necessary to change the cassette with every change of chain - I usually change my cassette every other time I need to install a new chain, although I've heard some say that a new cassette is only necessary after the third chain. But with KMC chains being so hard and long-lasting, I'm wondering whether it's necessary to change the cassette every time you change the chain.