I found them quite similar actually - outside of the name changes given to certain people.
Perhaps u need to watch the film again. The order of events and their usage is different in various places. There are bits in the film that have been overegged - the treatment of the FBI, his interaction with them and related boardroom speech don't tie up. All added for dramatic effect of course. There are also many elements not included in the film.
Estrella Del Sur is very average compared to Galicia. Still don't understand the lack of love for the Mahou. Maybe it's well looked after where I go. It's that and Galicia that everyone mostly drinks round that way. More Mahou. Used to be a fan of Cruzcampo years ago but gone off it now