To the best of my lay knowledge, these are not synonymous terms.
Here's a recent professional journal article on the subject:
Atypical depression: current perspectives, authors Dorota Łojko and Janusz K Rybakowski
Quote:
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The concept of AD [Atypical Depression] has evolved through the years, and currently, in Diagnostic and Statistical Manual of Mental Disorders (DSM), Fifth Edition, the specifier of depressive episode with atypical feature is present for both diagnostic groups, that is, depressive disorders and bipolar and related disorders.
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From this I understand both families of disorders, depression and bipolar, can be sub-categorized in atypical forms.
Of course, that doesn't mean laypersons and even professionals won't use the term any way they want. You'll have to ask whoever is using "atypical depression."
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My dog
mastered the "fetch" command. He would communicate he wanted something, and I would fetch it.