Sorry about that break in transmission.
To add to the weight of Kung's theory that we should all just get along, Karl Barth wrote a letter to Kung (that Kung has placed in the front of his book) saying that what Kung says about his doctrine is all accurate. He's not twisted anything that Barth believes.
Sounds good, doesn't it! A protestant and Catholicism agreeing on Justification!
Unfortunately, it's not as good as all that.
Firstly, Kung's version of Catholicism isn't what the infallible words of the Pope (backed up by the council of Trent) actually teach. It's the opinion of some modern (and more Biblical) Catholic scholars, but not the official teaching of the magisterium of the Catholic church. More's the pity.
Secondly, the bits of justification that Kung is dealing with are so narrow as to make it pretty easy to get agreement on it. They essentially are both anti-Pelagian, and that's about as broad as the agreement can be said to extend. Alistair McGrath has noted that in this sub-section of doctrine, even Calvin and the Catholic church could be said to agree! Even I agree that Manchester United play football, kinda.
Lastly, the implications of the doctrine of justification, all the things that are implied by it, are massively different across the protestant and Catholic divide. While the words may be the same, the implications are a world apart.