Here's my boots:
I've had them for about a month, and I haven't worn them outside yet. The boot on the left seems to be what dshack has described as full-grain leather, whereas the boot on the right seems to be split-grain. The leather on the right boot is thinner/flimsier, more wrinkled (as you can see), and fuzzier on the inside.
Here's a few shots of the inside:
Left Boot (Full-grain)
Right Boot (Split-grain)
And here's the lot #s:
This is from the left boot. The #s on the right boot are already starting to wear off, and look like they were stamped on differently. Though the #s do match.