In the 1st picture it's pretty hard to make out the markings, but the 2nd one, you can really tell. The markings are much lighter than the rest of the coat. That is what Albino breeders today are calling "Cream". That isn't an option on the registration application.
Due to the shades of white, like the dog in the 2nd picture, years ago, that's probably why some may have been mistaken as being Fawn w/White Markings. More than likely produced by 2 Colored Dobes that carried the Z gene, and the breeder or buyer probably never even gave Albino a thought because both parents were colored. Haven't been able to find anything on that yet. JMO
If you look at two Dobes of the same color, ANY color as long as both are the same color, there will be a difference in the tone/hue/shade of both dogs and the difference might be very slight yet it could also be drastic.
Black: I've seen black & what I'd describe as Raven Black (still a Black Dobe w/rust)
Red: washed red to a deep red some consider chocolate (still a red Dobe w/rust)
Blue: a medium to dark grey to a dark steel blue (still a Blue w/tan Markings)
Fawn: from almost blonde to a medium tan (still a fawn w/tan markings.
Albino: Solid snow white to, hmm, can't even put a color to it...bright white, soft white, off-white, eggshell, beige, antique white, ivory, seashell.... I don't know, pick one!