The "eastern variety" of red cedar, or Eastern Red Cedar is also known as aromatic cedar (the kind you line closets with). It is very knotty and unsuitable for boat building. Northern white cedar grows in the northeast US and Canada. All the red cedar used by the major companies (Old Town, etc.) was shipped from the west. I believe all the Chestnuts I have had come throught the shop were planked in white cedar, which makes sense, since it grows in New Brunswick. They may have had red cedar shipped in as well, if supplies dwindled.
Cheers,
Dan