Hivemind
We're Touched
No real difference if you're going to try and make a point based on head injuries killing people via delayed effects.
Here we go
There absolutely is. One is inherent risk of playing the game. The other is additional risk tacked on for spectacle's sake. Sanctioned fighting is not some intrinsic part of contact sports (see football) or even hockey specifically (see Olympic hockey).
And I do think there should be steps made to mitigate the risks of head injuries from other contact, largely through better enforcement of safety gear standards. For starters, make player's tighten their chin straps, for Pete's sake.