AFAIK, you can't see any detail of the circuitry in that blu-ray scene cuz it's so dark. I could be wrong, though.
However, I think that parts of SW would be the one to go by, but again lack of detail makes it difficult.
There were so many Luke sabers made, ANY one of those could be considered "accurate" IMO, and since no circuit board appears to have gotten any actual screen time, who will ever know, right?