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Auto sexing is like the Wheaten and Blue Wheaten Ameraucanas, at about a week old you can easily tell who is male and who is female. They turn different colors, always. No confusion. No matter the generation or anything.
Sex-linked IS the first generation only, there are differences between male and female to tell them apart (like a spot on top of girls head) but it's not always 100% fool proof, occasionally one who looks like a certain sex will turn out to actually be the other sex, and if you then breed those two babies together the offspring will NOT be sex-linked.