After thinking about it for a while, I am pretty sure that the light colored pair on the far left is Natural Chromexcel. The leather looks just like my pair of Clark Streets in Natural Chromexcel. Maybe I have some kind of unique collectors item and I didn't even know it?
To my knowledge there was never a Chromexcel McTavish, and AE didn't even have a Natural Chromexcel offering back then. But you may be able to tell if it's Chromexcel by inspection (or even just scent).
I believe the one on the left was the discontinued Brown Distressed mentioned in the outdated ShoeCareReference.pdf, and the one next to it is the Natural Wax Infused still offered today. I believe the Brown on Amazon is the Brown Distressed, while the Dark Tan and Natural are the Natural Wax Infused.
Ideally I would've just linked to the Shoe Bank pictures, but the search functionality is currently down.
No, the Cognac Dublin is the 3rd. I believe the 1st is the Brown Distressed and the 2nd is the Natural Wax Infused. Here are pics from the Shoe Bank where they call them Brown and Tan:
Brown (Brown Distressed):
Tan (Natural Wax Infused):