You betcha! In the Dictionary of Real Estate Appraisal they are considered the same.
However, I do prefer to call the condition "economic obsolescence" if it is a locational issue (bad market area with higher vacancies than the norm) that impacts the property's cash flow. If the condition arises from an "unsavory" condition nearby the property, I prefer to label it "external obsolescence." In either instance, the condition impacts the ability of the property to generate income. They are, although the terms have subtle nuances, one and the same.