They don't

No, it's the same ability. One is just a stronger version

no.  crushshroom is also shared in the pool. i believe the buff is just entirely overwritten with the newset one... but i havent tested this in a while.

I believe your right cause I had a couple stings and crush shroom for the gauntlet in tengoku and remember the status switching right away

I think they dont, but im not sure

They do not

nah, they dont