[hmkpoker]

I think OP made a mistake in the way he worded the question. Most people would agree that the soul would correlate more with the brain than the rest of the body, so putting A's brain in B's body still leaves the B body with A brain with all the responsibilities of the orignal A and vice versa.

But...

Let's say the procedure were different. Rather than yanking the big cerebral mass altogether, what if it was transplanted nueron bundle by neuron bundle?

NOW we run into a slew of philosophical problems.

At what point does soul A officially transfer into B's body? If it does at some point transfer, then what if a different neuron bundle were switched over before that point? Is it possible for the soul to be an amalgam...that is, part A and part B...and if it is, don't we have to rethink what a "soul" is?