Despite headline from the seller 729 x-6 blade seems to be 5 wood + 2 ALC composition but inner (ALC close to the core under second thin wooden ply) while Viscaria is outer composition (ALC under top wooden ply). Also top ply on x-6 doesn't look like Koto but I'm not the expert. And then different thickness. Compare yourself:
729 x-6
Buterfly Viscaria
But overall it can be good bang for a buck! If you want some closer Viscaria clone go for Yinhe V-14 or similar.