Imo, I think 0AD is already avoiding being an AOE clone.
So, in AOE ( AOE I and AOE II specifically) Each faction is almost IDENTICAL with the exceptions of a single unique unit, 2 or 3 unique techs, and each tech tree is missing some techs here and there. Besides that, all the factions play the same, and have access to almost all the same unit types.
0AD has faction-specific rosters, which AOE doesn't ( AOE III does a better job of this )
I'm still a fan of fixing maps, but formations and cav charges need to be implemented first before all this.