Pretty positive it does. I haven't tried it yet, but the only difference between this and the iberian mace is -1 damage for +4 length. Should have a really solid knockdown.
Actually, there's another difference. The Iberian Mace has a wooden shaft, which means the weight is concentrated in the tip of the weapon. The Spathovaklion is all metal, which means the weight is more evenly distributed, so technically, it should be worse at knocking stuff down.