Mechanical telepathy may be possible, and for me could possibly answer this question. You and they put on a device whereby you tap into their conscious experience, see through their eyes, hear the voices in their head...
Even then, you're still only experiencing your own, single, unitary stream of experience, you've just replaced or superimposed parts of it with signals from another nervous system. But even if you can somehow replace/superimpose the signals coming through their optic nerve, for example, into your own experience, that still doesn't answer the question of whether or not they have their own stream of experience to begin with. That is simply unknowable, outside of the reasonable assumptions we all make to avoid solipsism (but they are still assumptions at the end of the day).
That seems unlikely, as neural networks don't all develop exactly the same. There is some natural variance which brain regions perform which function. E.g. Broca's area (very important for speech) only 'usually' lies on your left hemisphere. We know from experiments that stimulating certain areas of the brain produces certain (predictable) feelings, but to stimulate the brain in such a way to transfer an exact thought or a specific vision would seem impossible without a very detailed scan of the source and destination brain, and a complex remapping in between. And some experiences may not be transferable if the target doesn't hawe the required circuitry.