Backup Memory required differs pc, cloud

when tried 16 gb iphone in itunes cloud, had 3.3 gb remaining memory available. when tried same iphone pc (win 7, 64 bit), shows on memory on 14 gb! going on here?

 

because itunes bought media , apps don't count towards icloud allowance. on apple's servers no need upload again.

on pc has copied itunes.

 

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