Finding the pin number?

Hi, I'm planning to buy a new laptop in the future so I want to prepare for what I need in order to transfer the norton internet security. It seems that we need pin number but I ended up with few problems;

1. I went to my documents -> Symantec  and found Norton 360_Key.txt with product key inside instead of pin number. What's going on?

 

2. I have Norton Internet Security installed instead of Norton 360 so why does it say Norton 360 key.txt? Are they same thing?