Deadpool became Deadpool through a series of complex and sometimes convoluted events in the comics. He was originally a mercenary named Wade Wilson, who underwent experimental treatments that gave him his unique powers and personality.
There is a loose link. The version of Deadpool in Wolverine Origins provided a starting point, but the standalone Deadpool movies developed his character and story in a more distinct and expanded way, deviating from the initial portrayal to create a more focused and engaging narrative.
It's a bit of a mixed bag. While there's a link, the portrayal of Deadpool in Wolverine Origins doesn't fully align with his later, more developed storyline. Some elements were changed or not fully explored.
The Sao Progressive Vol 1 Light Novel was more about the initial exploration of the Sword Art Online world. It introduced us to the basic rules and the main characters' starting points. But Vol 2 is different. It may have a more intricate plot with more twists and turns. The character growth is more evident in Vol 2. For example, the characters' skills and strategies might have evolved. Additionally, Vol 2 could introduce new elements in the virtual world that change the dynamics of the story, such as new items or abilities that impact the gameplay and relationships within the story.
Obviously, the main characters are the two Deadpools. They are both versions of the same character but with potentially different backstories and personalities in this graphic novel.