That clean tone is INSANE!
I've been fortunate to see them a bunch of times over the past 2 decades & remember hearing the difference from the old triaxis blended rigs, diezel & everything else they used up until the fractal stuff...wasn't it for the Antarctica gig where they really committed to using them as primaries after that (since they couldn't have a big foot print worth of gear down there or omit sound past a certain decibel range as to not mess with the penguins..lol so they constructed that bubble & everyone in attendance listened through headphones with only the drums & singing being audible..)
anywho..i remember back in the 1st quarter of 2018 i believe it was when they transitioned to the III's from the II's on the road...i think it was El Paso..prior to that show on that same leg of the tour..might have been the previous leg...chad had the II's in the rack case next to the midi controller....but at El Paso (& after) it was now the III's..the difference was noticeable..in person at S&M2 the distortion was "grittier" than i remember...idk if that was done to further stand out in the mix in the chase arena or if that was just the updates they'd made to their tone since the end of the arena/stadium run.
The Hetfield clean on Ktulu & NEM...did i mention insane?