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2.
Was a part of the Soviet Union (USSR)
3.
Borders the Caspian Sea
5.
Has territory in the Hindu Kush mountains
6.
Has a crescent on its flag
7.
Is larger in area of the two
8.
Was temporarily controlled by the Taliban
9.
Is a secular state (does NOT have an official religion)
10.
Has a higher infant mortality between the two (110 deaths per 1,000 births)
11.
Its currency is the Manat
12.
Has a higher rate of poverty between the two
13.
Is a Turkic State (Turkic-speaking or Turkic origins)
14.
Became the first Democratic Muslim State in 1918
15.
Its second largest city is Sumqayit
Update: Jetpunk Redditers explained that Azerbaijan IS considered landlocked so I'm going to keep it =)