Borrow some money or sell something, a reptile must have heat to be healthy. Both snakes need heating so there's no use in taking from one to give to the other. You also should not feed if there's no proper heating as it won't be able to digest properly. I would bring this snake back to the pet store until you can setup a cage for it. Get your cages set up with proper heating on thermostats, then add snakes. Do you have a thermostat on the uth you do have? What are your temps and how are you checking them?