Big ol' difference between'em.
In 3 chapters, 1023 to 1026, Sulong Inuarashi has Jack the Drought beat.
In 11 chapters, 1011 to 1022, Killer just pushed Hawkins to his last life (Kidd).
Whole lotta events and time passed between 1011 and 1022 and Killer's just getting to the end of his fight, Sulong Inuarashi was a single blow away from victory before 1026 but the weather changed on him. He can ground pound an Ancient Zoan in significantly less time.
Killer's probably a little faster and has better CoO than the Sulong Dukes, though I don't remember us getting reaction panels for'em to invisible slashes. Their AP, haki and endurance is significantly above his.