[LisaS]

I'm sure Alan would have a field day with this question - but the facts are that the breakdown of the sugars & starches in the foods are different. Whether it makes any difference at all for your purposes that fruits have fructose and grains have starches I'll leave to mr. Aragon.
But here's an example:
Sugar breakdown for 1 med apple:

Carbohydrate, by difference	g	25.13
Fiber, total dietary	g	4.4
Sugars, total	g	18.91
Sucrose	g	3.77
Glucose (dextrose)	g	4.42
Fructose	g	10.74
Lactose	g	0.00
Maltose	g	0.00
Galactose	g	0.00
Starch	g	0.09

Sugar breakdown for 1/2C oatmeal

Carbohydrate, by difference	g	27.42
Fiber, total dietary	g	4.1
Sugars, total	g	0.40
Sucrose	g	0.40
Glucose (dextrose)	g	0.00
Fructose	g	0.00
Lactose	g	0.00
Maltose	g	0.00
Galactose	g	0.00
Starch	g	23.46