I honestly don’t know enough about Wyandottes to be able to comment on that, but they do appear to have at least a few differences.
Their comb types, most notably. Rose combs can get quite large and do hold a lot of surface area, so perhaps a cushion comb is more well-suited for the cold.
Partridge Chanteclers are also similar-ish to the summer feather colours of a Ptarmigan, so that’s another plus!
@Canadian Wind (apologies if you don’t want to be tagged, Wind!) has kept them, so he might be more useful here.
Hopefully you get the dog situation under control. I’m sure they’ll love ranging