other organs is like plumbing. you mostly just have to connect up the blood pipes. nerves are way more complex. memory can’t be transfered at all. If it could be done its not really a brain transplant its a body transplant because the brain is the individual. thing is there are all kinds of things about your body that effects you so changing the body would change you a lot. hormones and such. it would be wild but its hard to say if we will ever be able to do something like that.