Exactly, so CoK works like some kind of 'Shinra Tensei' from Naruto???Let's put aside that fodders since we didn't talk about them hehe
If by any chance there's a slight movement of them both thrown aback after that hit, it has that effect on them two. In Luffy & Don case, what i meant was that very attack itself, those sparks etc but if you were referring to the fighters' conditions aftermath, it was equal between them since they were standing just fine.