Leather - Somehow I missed the comment in their description at the bottom that it is the "Brown Alpine Grain" leather. So I think the two shoes have the same leather.
Welt: The TSW Brown CXL's do appear to have a flat welt, but the TSW Brown (Brown Alpine) seem to have a reverse welt
(from the TSW site)
Now I understand the leather vs. commando sole. I'm in the technology industry, and I'm amazed how much terminology there is here!
Also now noticing the brass vs. dark eyelet/hardware (on the TSW's).
I might sit tight and hunt for a brown cxl nst...