Even on-axis and LW wise they are not the same, they are similar in a certain sound pressure level band (e.g. +-2dB, if one ignores the different slopes in the low frequency range), but to say "they are very similar" measuring wise would be not correct.
For what it's worth, I thought the on axis measurement, at least, would be more interesting if it was more apples to apples. If the KH120 graph is from Neuman, how does that compare vs Genelec's own graph for the 8030c.
In this graph, the blue is the KH120 and the Green is the 8030c. I do not know why there are two lines for the 8030c diverging at 150hz. It must say somewhere, but I'm not seeing it. I matched up the grid scales in photoshop, but NOTE that Genelec is reporting for 85dB/1M and Neuman at 90dB. Not a fair fight.
Like a lot of people reading this thread, I'm in the market for speakers and am looking closely at these. In my mind the biggest pros/cons are:
KH120 has more headroom vs 8030c, I think. Louder without bass distortion. (I do not know why the graph CTRL put up appears to show better KH120 bass than the one I just got from their website here:
https://en-de.neumann.com/kh-120-a-g That's puzzling. But it probably does have better bass, if only because of its amp power.
Cons for the KH120: Heat. It has A/B amps and no sleep mode, so you would want to manually switch it off when not in use.
That probably isn't a big deal for most people, but my listening room doesn't seem to get as much AC as the rest of the house, so...
The main problem with the 8030c is it's probably underpowered for mid-distance listening.
Personally, I would be surprised if I would hear a ton of difference, except when playing loud. And since I would probably cross over to to the sub around 90-100hz, the low end of the bass is no biggie to me. And I'm deef over 12.5kHz, so the high end isn't either. One of these days I'm going to have to go the the Guitar Center and see if I can actually hear them.
I'm sure their listening room is exactly like this one: