It is similar to two other golden plovers: the Eurasian and American plovers. The Pacific golden plover is smaller, slimmer and relatively longer-legged than the European golden plover, Pluvialis apricaria, which also has white axillary (armpit) feathers. Overall, the Pacific golden plover is found to be more similar to the American golden plover, Pluvialis dominica, with which it was once considered conspecific as "lesser golden plover". The Pacific golden plover is slimmer than the American species, has a shorter primary projection, longer legs, and is usually found to have more yellow on the back.
This site contains all information about Pacific Golden Plover Migration.