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

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!! ;)

Hopefully one of the breeders will pop up & help you but from what I have seen when I have been at my friends when babes were born you could pick up the silvers but smoke was more difficult,could just have been me not having the eye for them.
Good luck with making your descion,could be one of the hardest choices you have to make...x