Vaalingrade
Legend
Wait no.Except in the fction, they're supposed to be the same monsters,
They're the same species, but they're individual dudes. Some of those dudes are just sad goons who will dies quickly.
Like in-universe, there's not some vetting society that drops ogres from varying heights to determine how many HP each and every ogre should have. Some will fall fifty feet and be fine, some will trip on a gap in a brick and break their neck. This insistence on 'consistency in fiction' actually make things very inconsistent with how things would happen.
Some folks are just unlucky and die easy. There's probably dragons in-universe that die from pneumonia regardless of what the average Fort save says in the stat block.