I asked Kiya about the product descriptions and got a pretty quick response:

“The 633s-SBG is very very lightly rinsed, we still consider it "raw".
Where as the 8301 isn't rinsed at all, so there is more shrinkage there, especially for a sanforized denim.
I wouldn't expect the 633s-SBG to shrink that much, and they run a bit small so most of our clients have been sizing up.“

Sounds like the 8301 is pretty much an unwashed sanforized fabric.

Dumb question, but is this the exact same fabric as the non-Self Edge collaboration cuts? The 888, 555, 634, etc don’t mention the waist and inseam shrinkage like the description for this pair does on Self Edge’s website.