Silver, shaded and smoke, can I see it since the first day?

[Goofycat]

Hi everybody,
As I written in the title, can we see if a MC is silver, shaded or smoke from the birth?
I gotta chose between 2 females tortie, and I would love to have a smoke, but since now I only saw a picture made the birth day, I cannot chose.. is there something to look at to be sure?
I'm not really in a hurry since the breeder put the 2 on hold for me till the age of 4 weeks, but I would like to... well... know more and more!! ;)