I'd certainly believe it based on the condition of the paddocks and how frequently they need to be rotated for some of the groups!!!!
(To clarify - the Naked Necks have the shortest nails... and I have to rotate them the most frequently. I think the Cream Legbars might be longer in part because they had a harder time of it with dry fowl pox than the other chicken in their area...)
My NNs also have some of the shortest nails, along with my White Rocks. A couple of my NN hens have nails so short that they started injuring the tips of their toes when they scratched.