Can someone explain the difference between Kid Cable and his older version?

I’m reading the Krakoan age. I’m at the point where Cable resurrect his older self to defeat Stryfe. I’m a bit confused on the differences between them btw. I wanted to know what are their respective universes and what’s the story behind them. Is kid Cable the 616 version, while his older self is another universe? My idea is that the kid is 616, and old man is 616 but in the future. Btw you are the experts, just let me know.