According to his measurements, there's like 3-4dB of rolloff in the bass (slight mismatch).
I'd also argue that Rin's lower to mid-treble doesn't look at all identical to Purrins. The upper treble you can pretty much ignore on these graphs. The only problem is the comparison is useless because they are different sets of ASG-2.
I personally hear a dip as big as Rin's graph shows in the treble but centered and similarly as linear as Purrin's graph shows instead of a very sharp peak.