What was the fundamental design difference between the 'Little Boy' and 'Fat Man' bombs?

Little Boy was a fusion (hydrogen) bomb; Fat Man was a fission bomb

Little Boy was a gun-type uranium device; Fat Man was an implosion plutonium device

Both used identical implosion designs but different casing materials

Little Boy used plutonium implosion; Fat Man used a gun-type uranium assembly

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The Atomic Bombings — Hiroshima and Nagasaki (1945): Multiple Choice

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01What was the name of the aircraft that dropped the bomb on Hiroshima?
02On what date was Nagasaki bombed?
03Which city was the primary target for the Nagasaki mission before weather and visibility issues led to a change?
04Approximately how many people were killed immediately (roughly) in Hiroshima by the blast and immediate effects?
05Approximately how many people were killed immediately (roughly) in Nagasaki by the blast and immediate effects?
06On what date was Hiroshima bombed?
07What name was given to the bomb dropped on Hiroshima?
08What name was given to the bomb dropped on Nagasaki?
09What was the name of the aircraft that dropped the bomb on Nagasaki?
10What was the fundamental design difference between the 'Little Boy' and 'Fat Man' bombs?