Why is the formula for sucrose the same maltose?

Yes, both disaccharides share a common condensed chemical formula, that is C12H22O11 with the same molecular weight, 342.30. However their structures differ one another. Sucrose is a disaccharide composed by a glucose and a fructose, its chemical name: alpha-D-glucopyranosyl-beta-D-fructofuranoside. Maltose is the condensation of two glucose molecules, its name is: 4-O-alpha-D-glucopyranosyl-D-glucose.