Not necessarily, imo those 2 different reactions just show their nature:
- Kidd with some headhache on the ground, questioning where they are, ready to jump into action ---> The impulsive Captain (more similar to Luffy)
- Killer already on his feet, on guard, aware of the surroundings and ready to follow Kidd ---> The attentive First Mate (more similar to Zoro)
So I wouldn't read to much into this (in regards to who is tankier), the point of the scene is that they took that tremendous attack well and are right back into action
Also, if I had to bet my money on who's tankier out of the 2 I would say Kidd tbh