I will be bringing two kittens (4-5 mos old) home on Wednesday. They’ve been using a fresh step clay litter. I use world‘s best. I know you are supposed to switch gradually, but at this age, with a new home, do you think I can try just putting out the world’s best and see if they use it? If they don’t use it by evening I could run over to the store and get the fresh step. I will be sequestering them in one room to start. Is this a terrible idea?