A guy who catches 120 passes is taking approximately double the tackles as a guy who catches 60 passes. Does that double the injury risk? I would say so.
I will take the guy catching 120 passes with 2x the injury risk over the guy catching 60 passes.
Not to mention, it would likely be more like squaring the likelihood that he does not get injured. Not the same as doubling. Though, given the fact that each catch is additional wear, it could be somewhere between what I said and double. Not any kind of expert on medicine.
I just figured that if I bought 2 lottery tickets instead of 1, that doubles my chance.
Each tackle doesn't have a fixed rate of potential injury, so that is not a direct correlation. However, the "opportunity" for injury is approximately double.
It's the difference of a guy getting gently pushed out of bounds vs blown up over the middle that makes any type of distinction tough, but in my book if I touch the ball twice as much as you, I have twice as much opportunity to get hurt. The rest would come down to body composition, toughness, etc.
For instance, my likelihood of getting injured on 1 catch is more likely than any of these guys getting tackled on 500 catches and then it scales from there. Lbs.
You'd need some kind of supercomputer to quantify it.