I only have the V-L and U-S pads. From measurements they do the same thing FR wise, but they do sound different. U-S has a little more slam in the lows and soft leading edges for treble. The V-L is kind of the opposite. Does not slam in the lows as much as U-S and has better/crisper leading edges for treble. I think the slam comes from the depth of the pad and the softness comes from suede.I hear Verite lambskin and Universe suede are quite similar FR on the Aeolus. I can report back when my Universe Suede pads come in since I have the Verite pads to test against.
That is what I am interested in the BE2 pads and what they do to the sound. I have seen measurements showing that pad gain/change is not linear between the headphones (BE2 being closer to verite pads on the verite than universal on the new chart below) but if the BE2 is closer to the verite as people report FR wise for aeolus, the other sonic traits, could be different (staging, imaging, transient response, etc). And the fact it comes in three variants (L, S, Hybrid) could be quite fun to play with.