To me, replacing a 72-pin connector in an NES with the 72-pin connector from another NES would be akin to replacing the engine in a
Chevy Vega with the exact same engine from another Chevy Vega. It may work at first (if you're lucky), but will be far too likely to break down again in the same manner before too long. As I said above, if it were a question of having something be original or having something work, I'd go with the latter every time. There's no sense in having something be completely original if it means it'll just sit on a shelf not working.
-Adam