Trivial. GR07's membrane is ever so slightly thicker and much lower tension. Sony likely has a very tense membrane, that's why they have way more high frequency modes and why they had to add foam/rubber ring mounts or it'd break on a cough. (also for dampening, which it doesn't have enough of either)
Of course I'm only inferring that from the published driver construction diagram.
GR07 has very few breakup modes up high - the 6.5k/14k peaks plus plasticky ringy reverb come both from the shell, not fully dampened half-wave resonance, relatively easy to fix.
Have a nicer pic with more light, not much better though.