Kata's best attacks are - Power Mochi (>= an Elephant Gun) and Zangiri Mochi (exact portayal as a Snakeman King Cobra).
Zoro hits much harder than that, heck I'd say even pre Enma Zoro hits much harder than that.
Mogura couldn't even tag Base Luffy without FS and we all saw how King is seemingly immune to stab injuries this chapter.
Those attacks aren't doing anything to King. Marco drawing a couple of drops of blood from King doesn't mean Kata can. And if even Marco, a mythical Zoan known for physical strength and speed, can only get few drops at best.
King is genuinely made out of a different material. And the best part is he is yet to go all out.