Thats not a improvement, thats completely different. Basically, take your 57 Chevrolet to a mechanic, ask him to improve it, you know, tune it up, modify some of the parts make it run more smoothly. When you come back, and its a 64 Ford Thunderbolt, he says since its a better car, that it is improved.
Would you be happy or unhappy? Would you call that an improvement or a completely new car?