With a tanned skin you might be able to rehydrate and mount but, your main problem will be the face, as if it has memorized the shape of the manikin , you won't be able to shape it to a new manikin.

When I have done it i use the same manikin and then alter it a bit to improve muscles and veins and then use hide glue real heavy and reglue the face so it picks up all the deatils.