If they test the same, then they sound the same. The kicker is to do real-world tests and not simply use test tones, which do not put a piece of equipment through its paces.

...which is exactly why blind tests with actual music, using 100% real human ears and 100% real human brains are so vital to getting results. And you know what? These tests have been done many times. I'd tell you about the results of such tests, but JohnK has already done that many times.