let me know when a hockey player can sprint 40yards in 4seconds and then weigh in at 250lbs which is the low end of league weight average. Then picture hitting head on with 250+lbs of player. Do you seriously think hockey hits are harder? i couldnt tell if your were being serious or joking.
200lb football player hitting at average of 4.5sec 40yd dash has the impact of 1600lbs or force.
here is a chart of common gforce that people can encounter just for reference of a football hit.