What's the relation between yalahar chemical explosion and zao corruption? (mutated creatures PoV)

Question

Zao and Yalahar suffered from what it "seems" were 2 different corruptions, both of these lead their inhabitants to their "destruction" beside what affected yalaharian lead to almost the "erradication" of their race, or at least that's what's known in surface, many people will point out due certain theories to variphor influence, and probably these are true, but I want to take this issue from a different approach, beside many things went wrong on yalahar and corrupted their inhabitants in serious different ways most of these also transformed the shape and behavior of the affected ones, specially the air corruption of the alchemy quarter remains of the explosion, now, the interesting part is how it affected the creatures, turning them into fairly strong monster, even those out of the alchemy quarter suffered serious transformation, from those, one kind of creature is encountered in other different places, generally related with chemical corruption, these are the mutated, specially the mutated bats, rats, and tigers, which are really interesting, common animals (rat and bats) became stronger than human and almost as strong at tigers, and tigers didn't become something incredibly strong neither human which lead me to believe that tigers weren't transformed from actual tigers but a more "trivial animal on Yalahar...

Now, lets take a look on the situation of Zao, a huge civilization of lizards who was "helped" by dragonkind to win the greatest tribe war of zao (human vs orcs vs lizards) victory that lead to almost the extermination of human and if weren't by mooh'tah people were a similar fate for orcs. then a nocive corruption plagued zao and lizards were infested by a corruption that transformed them, a plague that not only infested the lizards now "slaves" of the dragonkind, but also transformed most of the foe in mutated versions of their prior-self, which bring a considerable amount of new creatures but also the fairly known mutated animals from yalahar, as if they were affected equally beside the corruption on that place seems a bit different, it lead me to ask: what happened in these places that lead to similar creatures to mutate? Now, without further ado, I want to know if there's  any reason in which the corruption from zao affected "equally" as the chemical explosion from alchemy quarter:

Are these creatures "equal"?
What were Mutated TIgers before their infestation? could it be that those were cats?
Why it seems like if those corruption affected mainly "trivial" foe? could it be the longer exposition periods?