I noticed this weekend that there are two different "screw-versions" of the old NES games. As we can read on Nintendo Age, most of games have both version with 5 and 3 screws.
Here is a great example :
Do the games are 100% identical in-game? For some titles, there is a huge price difference between the 3 screws version and the 5 screws one and I want to be sure. Is the only factor the rarity of each version? Or there are in-game differences between those versions ? What is the reason there are 3 and 5 screws NES games?