Bat
There is a difference. Animal fat left as is can turn rancid. The key difference is rendered. The solids are removed leaving only the oil. The resultant oil is solid at room temps. Think lard from pork or shortening from vegatable products. The oil portion degrades very slowly. It seals the food from oxygen and micro organisums.

Pemican is OK but very rich due to the fat content. It is great fuel especially during cold weather.