I think so, too. It is my understanding that even a little yellow means they are, even if they aren't perfect according to whatever standard they have for Jerseys.
I think the feet look a little yellow, and, according to some, a little yellow means it's a jersey .... but I'm no expert! You'll probably find out a little more when you know where they're from :)
Out of curiosity ..... do hatchery "Jersey Giants" have a little bit of said breed in them or...