The differences are obviously: Animal proteins are the most important energy source. Milk, potatoes and grains are missing.

Meat, seafood, vegetables and fruits - which used to be our only food for millions of years - are less important today. About 60 percent of our daily energy are taken by modern foods.

Sources:

1. Loren Cordain: “Plant-animal subsistence ratios and macronutrient energy estimations in worldwide hunter-gatherer diets.” American Journal of Clinical Nutrition 2000, Nr. 71 - page 682ff
2. USDA Food Pyramid