My curiosity got the better of me and I looked at probably 30-40 SG's and EB's the past couple days and upon close examination it's actually the bass side that is minimally deeper in addition to the horn being longer.Nick man said:The SG shape is actually slightly non symetrical with a deeper cutaway on the trebble side.
Also while looking at so many Gibsons I happened to look at several EB-2's which were symmetrical.
A couple other symmetrical rarities I've seen lately was an Ampeg AHG-1 and an EKO violin bass!