Heres just to show a comparison between ranch and wild.
which is quite neat to see in the showing of how hand fed vs wild can show difference between the two.

You can see a larger comparison even within the first year
the ranch fox has larger paws
thicker leg bones
def. more fat to their wild cousins, except for Alaskan foxes at which ive seen have just as much fat on them as a ranch fox.

their smells are different as well, even from variation from farm to farm and region to region which is interesting
Kodiak AK foxes are more fishier
some of the northern foxes still within the US 48 have a slight musk but earthy
ranches ive had them between really skunky smell to a musk but their own kind of smell.

to the left is a 37 inch red marble fox that was in a US farm.
the right is a wild bastard ( cross fox but not fully) that is just 27 inches.
in showing the weight of the head, and paw differences.