Alliance are a serie of different mods. On the Star Wars GC, you can play the civil war Empire vs Rebel era + Black Sun and soon the Republic and CIS.
I have some changes. The Jedi Academy - Dark Saber conflict will be renamed to the Dark Saber GC. There will be some new heroes and it will start without destroy Carida.
You will note by the screenshots how the story from Crisom Empire will be more integrated in the GC.