I'd concur that Snakebite Leather is the core paint of the leather. Does seem a little more subdued though, especially in the second pic. Could be it's toned down with a drop of grey, or could just be the photo though eh.
Can't tell whether it's blended into that from a darkly-inked version of that colour, or shaded and built back up. The smaller insert suggest a bit of Bestial Brown in the transition between the somewhat subdued Snakebite Leather and the recessess, but could equally be getting that from an ink. The highlights would likely be Bleached Bone or White added into the mix.