'm trying to either reduce or control the bass on the Atrium Closed.
Should the suede pads I got with my Verite Closed fit on my Atrium Closed (Olive wood versions with the stock pads)? Or should I get a pair new Caldera Suede pads? I'm hesitant to fuss with the pads before I know it they would fit. Should I try other kinds of pads?
Definitely try the Caldera Suede pads - that's the reason I tried them in the first place, and it achieved exactly that for me: retaining bit bass impact, but no longer overhwleming and a clean separation and transition to the mids.
No, the Universe suede that you have from the VC would likely not work well and will definitely not sound like the Caldera suede pads.