I'm getting ready to oplay my first La Grand Battle game this weekend, and have it set up on my table for the first time for Austerlitz! Although the LGB maps are the same depth as Epic, each board adds three more hexes to the width of the field, for a total of 6 or about 25% more area (the two Epic boards have 20 hexes across).
The number of units confirms this expansion number:
French: Epic 39 LGB: 49
Allied: Epic 41 LBG: 52
Austerlitz after playing all the Standard and Epic versions--once more into the breach; dear friends! Hopefully with all 8 players, for a change--so far with Epic we've varied between 5 and 7 at the table.
I'm sure I could do the maths, but do you end up needing a second core box for the LGB?
And if you do is it really 'need' or just 'better'?