Y'know, I think you nailed it, Craig! The speaker cone paper had the same pattern / texture as my originals, but there were fewer, wider ribs in the suspension surrounds - and no doping at all. The cones did feel less "lively" when I pressed on them as well. I'll have to go back and play through it to see if that has a marked effect on the cab's tone. Thanks!
Ampeg Club #347, Thunderbird Club #69, SX Club Member in Good Standing, NJ Bassists #34