What is the fundamental distinction between the general term 'Whimbrel' and 'Eurasian Whimbrel'?

Answer

Geographic scope (Old World versus general species/New World)

The primary difference is one of scope; 'Eurasian Whimbrel' designates the Old World population group, whereas 'Whimbrel' can be the general species name or refer to the New World populations.

What is the fundamental distinction between the general term 'Whimbrel' and 'Eurasian Whimbrel'?
speciesbirddifferenceavianwhimbrel