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I wonder if the process whereby they make GDTs is not proprietary, but is instead available to anyone who possesses the cash to buy the rights to manufacture the tires that way. That would account for the differences in tire tread, but the presence of the GD grains in both tires.

I'm pretty sure this is the case...

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What do you think? The idea of having different sidewalls on my truck may have put me off of these for now.

Call them and ask - my 5 all matched.

Good luck,
Paul

'96 rodeo, 3" lift with both calmini and DOR parts, 265/75/r16's on Eagle alloys, K&N drop-in filter and flowmaster exhaust, superwinch hubs, TJM Bullbar, and a custom (home-made) rear bumper, and still working on it...