It's beyond physical strength. Therians have better senses and physical abilities based on their species, like increased speed or a prehensile tail. They also have DNA beyond just their specific animal. They have tardigrade DNA to make them resistant to radiation, which helps them survive on Mars. They have axolotl DNA to increase healing ability, though most don't regenerate like axolotls. Only special further experiments resulted in individuals with regeneration and, an extreme result, shapeshifting. These would be Rubi, Azura, and Jaron.