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I go by the bands on the cigars other than the obvious wrapper color (cameroon vs maduro).
The fuente regular line band bottom is green; the premium or gran reserva line is black on the bottom of the band (Don Carlos is as well) and the Anejo is white. Other than that I'm not sure. The sun grown line, Hemmingways, and Don Carlos is black. Other than bands, I don't know about any other way to id them unless you write it down when you buy them.

There was another way to distinguish the Don Carlos from the Hemmingways, but I cannot remember, now. It has to do with something on the bands themselves. Have you looked at all your black label bands to see if they differ?

Here's the solution:
Send them to me... I'll smoke 1/2 and mark them with a sharpie.... then send them back to you !! :o)

Always willing to help...

Low

Good question. Except the different color bands from the regular and premium lines as you already mention, it is difficult. Of course, color, size, shape and taste is a definite indicator. Once you smoke them, it's not possible to distinguish between the bands, e.g. which black band belonged to which.
I do keep my Don Carlos's cigars(my peronal favorites), in their own box(partially opened,of course) in my Humidor.
Ed

Wait, can't you tell the difference between a Hemingway and a Don Carlos by the shape of the cigar itself?

Hey! that's too obvious looking at the tips like that...sheeeite...didn't think of that but I believe you are right Watson! But what about the Sungrowns? I guess for the sungrowns, don't remove the cedar sleeve.

Tarheel, that is true.

Thanks smoker06, I didn't know that all of the Hemmis had the perfecto tip and the Don Carlos didn't. I haven't had too many of either. As a matter of fact, you were the source of my Don Carlos' that are confusing me. They are a remarkable cigar, thanks again.