No, this isn't going to work like that; these girls have had incredible levels of plasticity in their brains to be able to accommodate each other's functions in ways that are difficult for anyone but them to comprehend.

Take for example the case of people who have never seen from birth and are given sight through retinal implants; they can see colours and images and patterns but their brains can make no sense of the input - they sense no depth, shapes, relations between words and images, shadows meaning three dimensionality, etc. etc. that we all take for granted. Those neurones have been put to alternative use already and in some ways you really can't teach an old dog new tricks.