A vastly different seating of the driver (which is clearly evidenced in photos at this point) is enough to radically change the sound of the headphone, and that certainly qualifies it as a "newer model." Hell, we all know how much the sound of a Grado shifts when you slap the wrong pads on it.
I sort of ****ted on the grado sr60e when I had them for a very short while, before moving to a sr80e. Saying it sounded way too warm, thick, and lack definition. This came from a previous sr60 owner.
I'm somewhat sure that both the 60e and 80e was a Grado E-series 2nd production batch. The sr60e driver protrudes wayy to the front, in comparison to the sr80e I owned at the time. I don't have it now but I'm 100% sure that that particular sr60e driver protrudes even more than my current 325e.
I just checked, my current 325e has 1.0 cm distance between the Alu cups to the end of the driver. Based on that I think the sr60e was at least 0.5~0.8 cm more protrudes than the 325e.
I don't know about sounds and fixes,
but I can pitch in my experience that a Grado that was in my posession also had quite extreme protruded driver. I can see Mercuttio's logic in this, as I'm sure that a normal sr60e today won't have that protruded driver anymore (No bases on this).
In addition to bad sound, the driver protrudes so much it pushed against my ear, even with the S cushion. Compared this with the 325e and 80e that I got that was directly
grado-like in fitting.