The correlation you want isn't BMI<->calories, it's food type<->calories. The question to be answered is whether some types of food make it easier or harder to maintain a caloric balance.
It's not just satiety, there's also the fact that fiber prevents absorption of a percentage of ingested food, and possibly other effects on appetite and digestive efficiency such as gut bacteria.
Food labels do account for all the known digestive factors, but as I noted, they're estimates. Monitoring your diet and watching the result is still the best method of weight control.