yes
They are usually quite specific about which instruments (and how many of each) are used in their compositions.
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True
beacause it is my hobby
Although you don't list the composers from whom you want us to choose, the name you require is Leonard Bernstein. (The lyrics were written by Stephen Sondheim.)
SchubertWhat are the choices? You say "which" but don't give any names to choose from.
Many professionals will own one good instrument. Sometimes, if they own two, one will be used for certain pieces. Each instrument sounds different, so depending on the sound they want to deliver for each piece, they choose the instrument they want. There is not a difference.