So basically, all cybertronians born this way have the same base personality?
Because a certain level of the personality is carried within a human's DNA, "built in programming" if you will. If you are hot tempered, you will always be hot tempered. You might be able to take the edge off a bit, but you will always be that way.
But unlike humans, if this starting information is roughly identical for every cybertronian, than the base personality is always the same. Therefore, every cybertronian is a slight variation of the same personality.
Besides, studies show, (it's not fact, as it cannot technically be proven) that mental development, physical development, and informational development, (I'm obviously paraphrasing here) are all linked. You cannot progress much without development in the other.