A Pastel is a Pastel is a Pastel....Lemon is just a line named by NERD. If you ask Kevin, he will tell you the Lemon line is yellow, with the black staying dark black. Graziani, usually had lighter black, kind of a faded look. Most lines are going to throw nice, average, and ugly offspring. To me, a nice Pastel depends as much on the normal female's appearance, as the male Pastel. Breed a male Pastel to a dark female, and a light female, and see if there is a difference in the offspring...I bet there will be.
For those of you who have not gotten a Pastel, and are wondering which to buy...my advice, if you see a nice adult, buy it, reguardless of the line. If you buy a baby, remember, the orange will probably turn brown, yellow tends to stay yellow into adulthood.
Dave