question on diffrent wording on package

[sacedbysapp]

Went to my local Win Dixie to get 2 pork shoulder picnics  they only had 1 left but had pork  shoulder blade roast so wondering whats the difference?

 

[stovebolt]

The shoulder blade roast is the upper (butt) end of the shoulder. The picnic is either the whole shoulder or the lower part (shank end) of the shoulder (below the butt cut). The naming changes some with location.

Chuck