My take on those two components, as a gross simplification, is that the first is truth, and the second is tonality. As soon as I see the words "a little shouty", "bit of grain", "very slight haze", I see distortion (okay, everyone, down, down ) somewhere in the system being more clearly revealed by the first IC being more accurate. The second IC, on the other hand, is doing some filtering, hiding the unpleasantness that the first revealed, probably by effectively adding some treble cut, and thereby enhancing "tonality".These two ICs are similar and different in sound. The first is made of gold and silver wire. The presentation is detailed with sparkle and a striking holographic presentation. It allows the delicate nuances of the technique to emerge. I can see the pianist’s fingers on the keys, and can hear the hammer hit the strings. The decay is breathtaking, and so is the sense of acoustic space. Strings have a shimmer and luster. On the down side, it can occasionally get a little shouty, particularly during congested climaxes. There is a little bit of grain, and the middle midrange has a very slight haze.
The second IC is made of gold and platinum, and while similar, again different in a very subtle and important manner. The midrange has more depth and clarity. It is smoother and has less grain. I can hear the wood and the brass more, but a touch less of the technique. The note transitions and evolution are wonderful, and the beauty and colors of the tones are highlighted.
For what it's worth ...
Frank