I thought I'd mentioned "different injury texts" enough times to get that point across. I even said something close to these exact sentences:
Oh, maybe that's what he means, each specific injury text being linked to a specific injury %.
That still means I'd have to do the job a large number of times until I'm sure I've found all possible injury texts...
But anyway, that's indeed what I meant. The two screenshot injuries are clearly different; falling into a cactus is apparently more dangerous than collapsing from heatstroke, and probably less common too, though you'd have to test that. TW-DB will still show you the highest percentage of damage you can possibly take in one stint doing each job, though, and like I said, that's with 0 LP so it's generally going to be less.
Like Wondertje said, there usually aren't more than 3 or 4 potential injuries from each job, but some of them are so unlikely to occur that you may never find them. Look at Craft Dynamite, for example. There's one injury that job offers with a damage rating of 99%, but it's extremely rare. The listings on TW-DB - particularly for those type of high difficulty jobs where a super dangerous injury has been thrown in on top of the more common ones just to add to the risk - are definitely worst case scenarios.
EDIT: I'll also be the first to admit that my knowledge of the game hasn't exactly evolved over the last two or so years so there are many things I'm not aware of these days compared to in the past. If the information I'm giving turns out to be wrong I'll gladly accept defeat, but I don't recall any major job system changes recently that would have affected this.