I can’t get either clip to play, so I’ll take a guess without hearing them (I got a 50/50 chance to be right on each one)…I made some comparison clips of these two basses:
View attachment 4915131
T-bird had the neck pickup on only. The settings were the same for both. Can you tell which bass is the first and which is the 2nd on both clips? I'd guess the clean sounding is pretty obvious, at least on this group.
Clean - Tbird first, P bass second
Dirty - P bass first, Tbird second