Unfortunately, Nutrition data is more or less inconsistent. We use government DBs like Australian Composite DB:
https://www.foodstandards.gov.au/science/monitoringnutrients/afcd/Pages/foodsearch.aspx
And there is an article about food intake calculation explaining pros/cons of calorie calculation:
https://abe-health.com/tpost/ykb5mse1p1-measuring-food-intake-for-healthy-eating