I thought that was the point: same actual source of the chicks or ducklings, but Tractor Supply gets to deal with any that die while being shipped. I can see that as a possible benefit.
On the other hand, having them shipped directly to you from Hoovers will mean TSC cannot mis-label them or...
If you are just worried about frostbite, the ones with pea combs should be fine.
The ones with pea combs are most likely from Chantecler parents, and the single comb ones might be as well. Due to how the genetics work, it is possible to have a flock of Chanteclers with proper cushion combs that...