For many years now, Marvel Comics has dealt with the passage of time with a formula called the Sliding Timescale. It’s weird math that I don’t get, and generally dumb and bad anyway, but currently “Year One” for Earth 616 is about 2005, meaning the Fantastic Four launched into space and became heroes circa 2005. All the comics, sans things that have been directly retconned or elements that date them in-universe, are still canon. This means that early in their careers, the Fantastic Four still sold their film rights to Namor, a la issue #9. Since this was roughly 2005, this means that the real life
Fantastic Four movie released in 2005 could plausibly exist in the 616 as the movie produced by Namor.