I have a question on this regard thag my professor use to ask- imagine you are my favourite. AND you had a twin- with similar personality as yours- but if i could figure out that he or she is your twin- would i consider your twin also as my favourite? Even parents if they are very true have a favourite oe among their twin child. So,Certainly not. Similarly loading a personality to a robot is a great acheivement and could be a possibilty to immortality- but i guess you will always miss the actual "presence" of the person.