Can you get a better photo of the darker bird? Neither appears to be full silkie from the photos provided, but better pictures can help to narrow down what they are. Were these hatchery/store sourced birds or did they come to you via a private person/hatching eggs of unknown parentage?
ETA - so I don't appear completely crazy - the silkie reference is coming from a post that has been deleted.
I know she's 2-4 weeks from the store said but my 1st two were gifts for working on a farm but the are like 3 times her size but not full grown the "red" one's just now getting a cone I think it's a Rhode island red