That came to mind. Different species are native to the West and East in some cases. Most of the lumber we get here in the Northeast comes from Eastern Canada, as far I know.
We call those collar ties
I have panelled houses with a variety of wood. One home had a different type in all three bedrooms. We milled the bead board from square stock in our own shop. One room had VGF, another had D select pine, the third was done in Port Orford cedar. I also milled a bunch of reclaimed walnut into T & G beaded panelling for a customer.
Cabinets I’ve built have been all sorts of wood. My favorites were from really old reclaimed yellow pine. The lumber was milled from an old 1880s factory building that was demoed. The pieces we got were originally the main structural timbers from the building. The entire kitchen was trimmed out using the same stuff, including crown and base mouldings that we milled up. I wish I’d taken pictures of that job. The room was beautiful.