Re: aromic cedar vs cedar boards
I believe BB is correct.
As a tad I used to make trinkets of the heartwood of eastern red cedar for my sisters to put in their closets and bureau drawers. Very aromatic. That's what "cedar" chests are lined with.
The cedar fenceposts around The Hideout have aromatic heartwood as well, but only the red heart, and seem rotproof. Some have been in the ground for 100 years.
The western cedar used in construction seems to share the resistance to rot, but doesn't have the strong aroma of the eastern (heartwood only).