The stretch from person A is a better programmer / SW engineer than B to 'thus, person A is innately better' is unnecessary.
In my experience, the programmer that spends more time programming is almost always better than the one who does not. You can hate side projects, open-source work, whatever as much as you want, but IME, the programmers that engage in that (and thus have multiple times more actual experience than one who works 9-5) are universally the 10x people.
In other words, it's not innate intelligence... it's simple effort and working towards improvement.
Now... there are some people that are truly just stellar, and I can attribute perhaps some of this to innate ability, but the difference between mediocre programmer and 10x is typically one of hard work. Between 10x and the extremely rare 100x... well maybe we can talk brain differences. Those programmers are so rare though, it's futile to expect you'd be able to hire them, since there's not enough supply. 10x is good enough.
