Are "sympathetic nerves" the same as "cardiopulmonary splanchnic" nerves?
You might consider cross-posting to SE Medical sciences who know more about this stuff.

I think that they are simply using a more general term than other authors. In the same way, most people call crabs crabs, but some people might occasionally refer to them as crustaceans.

Based on wikipedia, it seems that cardiopulmonary splanchnic nerves are a subset of sympathetic nerves. The sympathetic nervous system innervates a large number of organ systems of the body (see image), such that the cardiopulmonary splanchnic nerves are simply the sympathetic nerves that innervate the heart and lungs. 

Looking further at the wikipedia for splanchnic nerves, it seems that this is a technical term relating to the fashion in which organs are innervated by the sympathetic nervous system; e.g. in my crude understanding they are organ hookups to the sympathetic nervous system.

In other words, all cardiopulmonary splanchnic nerves are sympathetic nerves, but most sympathetic nerves are not cardiopulmonary splanchnic nerves.