Kazakhstan is 6.1 times larger than Uzbekistan.
Area: 2,724,900 km2 World Factbook
Population: 17,948,816 (July 2014) World Factbook
Kazakhstan, officially the Republic of Kazakhstan, is a contiguous transcontinental country in Central Asia, with its smaller part west of the Ural River in Europe. Wikipedia
Area: 447,400 km2 World Factbook
Population: 28,929,716 (July 2014) World Factbook
Uzbekistan, officially the Republic of Uzbekistan, is a doubly landlocked country in Central Asia. It is a unitary, constitutional, presidential republic, comprising 12 provinces, 1 autonomous republic, and 1 independent city. Wikipedia