Interesting!
You probably noticed on your example that recent days are way more similar (identical)
The reason a close differ to an adjusted close are generally fix values (div/split etc ...) I mean not related to the place of exchange itself.
I won't be surprised that SMART Adjusted Close and NASDAQ Adjusted Close differ in 2002 because the Close itself did differ more from one exchange to another in theses epoch than the 'current epoch' post "Flash boys"
