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I have no doubt believing that FR EQ can explain (and erase) the majority of perceived sound differences among headphones.
I would also say, however, that headphones and speakers, being transducers, are going to be inherently lower in fidelity and therefore more variable in sound, than digital source components and amplifiers, which do all their work in the electrical domain (albeit both digital and analogue for some of those components).
And I think with headphones in particular, other sources of variability include impedance matching between the headphones and your headphone amp (as higher impedance amps can alter the response of high impedance and in some cases even moderately high impedance headphones); and the shape of your ears and the way the headphones fit on your head. The change in sound you can get from even small adjustment of the earcups or in-ear inserts of a headphone is far greater than the change in sound from swapping an amp or DAC, or in some cases even from swapping speakers.
I would also say, however, that headphones and speakers, being transducers, are going to be inherently lower in fidelity and therefore more variable in sound, than digital source components and amplifiers, which do all their work in the electrical domain (albeit both digital and analogue for some of those components).
And I think with headphones in particular, other sources of variability include impedance matching between the headphones and your headphone amp (as higher impedance amps can alter the response of high impedance and in some cases even moderately high impedance headphones); and the shape of your ears and the way the headphones fit on your head. The change in sound you can get from even small adjustment of the earcups or in-ear inserts of a headphone is far greater than the change in sound from swapping an amp or DAC, or in some cases even from swapping speakers.