Compare the composition of sucrose purified from sugar cane with the composition of sucrose purified from sugar beets.

Answer - They both are leading worlds sugar production extract and important to the economic and uses. 

But the difference is they both have different chemical make up and grown in different environment.
Sugar Cane is grown in tropical zones like Florida, Hawaii etc.. They can also be cut off the middle and harvest the other half for extract. Whereas
Sugar Beat is grown in temperate zones and are rooted in the ground which can be picked for extract. But has to be replanted which takes a while then sugar cane.

Two sucrose molecules, regardless of what their sources are, will be chemically and structurally the same.