So whats the real difference here? I read the books but other then how VPs are assigned any real differences slipped my attention.

All the text that differs between versions are highlighted in blue in both rulebooks.

But basically:

- Victory points are counted differently.

- Movement is slower in the epic version than the premium (you cannot chain movement in neutral territories).

- In premium, the whole map is occupied at the start where in the epic, just a few territories are covered.