The argument of the drivers being the same is NOT the same as to whether something sounds similar.
These are two completely different separate claims.
mattris is claiming the drivers are in fact different, and judges this based on differences in impedance, connector type, and measurable differences. In general, I trust the sensitivity of machines more than human ears, especially since human ears are very individualized and warp the sound.
soulsik is saying they sound the same, which I can neither confirm nor deny, but I don't really need to for something like determining whether the drivers are the same or different, regardless of sound.
Maybe actually address each other's points rather than argue why your specific claim is more important. It's pretty clear Soulsik can't claim "the drivers are the same", and mattris can't contest that they may sound similar.
Fact is determined by reality, not popular opinion. The laws of physics don't cease to apply simply because a majority of us wish them away. Espousing otherwise sounds like the argument of an advertising major.
If the headphones all sound the same or substantially similar, with the same or substantially similar power requirements and gain settings, there functionally isn't any difference to MOST users, short of a product defect.
And the reasons different drivers matters are various. Amplification requirements may be different, matching output and input impedance may vary, etc. And a difference in driver may matter if one lot of drivers is bad or has design or mfg problems, but the other lot of drivers does not, due to various differences in materials or production process.
There wasn't even the slightest attempt by any of the parties here to try and understand the point of the other side to make this issue clearer for readers.