Hey wassup guys!
Long time Jam fan here, read stuff on this (great) site before and member on Strange Design - I saw a couple people mentioned the discussion we were having over there about the speakers!
Jerry1996 is right IMO - the V30's have the smaller (and more common at least for guitar speakers) dust cap size, while the CL80 has a notably larger dust cap.
I am currently using my Mesa MKIII and an Avatar 212 with an English V30 from Mesa and a Chinese V30 (the Mesa one is voiced a bit warmer). To me, it sounds more Trey-esce than a G12-80/CL80/MC90. I've also used a bunch of Celestion Blue/Gold type speakers, which are on the money when I used a BF'ed Fender SFDR, but warmer, smoother and a little less articulate than the V30 so they lend themselves better to Fenders, adding some compression, compared to Mesa's that are already compressed.
I don't have any housing insulation in my cabinet, though I've read that could tame a bit of the high-end. My V30's are broken-in, but not like Trey's, but sometimes I feel like rounding out the upper mids would be nice.
I am thinking about going back to a 112 with an EVM12L - a little bland, but very smooth, or trying a Fane AXA12 if I find one cheap - I think that will sound kinda like a mix of all the other speakers I mentioned, lol.
Anyway - here is a pic of the dust caps. The bigger one kinda tames the top-end and makes it less beamy. The CL80 seems to be a warmer speaker than the V30 off the bat anyway. I'd think it would be a good choice - I was thinking about picking up an old G12-80 or a Mesa C90, which are supposed to be better than a CL80.