In alt.food.barbecue, Mike Avery wrote:

Any hints on pork cuts? Is the shoulder blade roast the same as a butt?

Yes. The "butt" part refers to the butt of the picnic shoulder. The
large part of a whole tenderloin, for example, is a "tenderloin butt".

--
A nation of sheep will beget a government of wolves.
--Edward R. Murrow