If being down about your job causes symptoms of depression that last more than 2 weeks, then it's the same thing. Psychiatrists diagnose based on symptoms. Worse, its usually what you say your symptoms are, with words and talking. They don't scan your brain. I've been seeing psychiatrists for almost 30 years. The good ones take plenty of interest in your situation, lifestyle, and other non-chemical non-medical factors. Psychiatrists don't distinguish between so-called 'situational' and 'clinical' depressions. Laypeople do that. If you get diagnosed by a clinician, that is the part that makes it clinical - it isn't a different kind of condition.