Theres no way to ever really tell. (why so many dealers make up names)

"Kush" usually is legit kush in my area, or at least some bomb indica. From my experience I've noticed things about kush. A very dense nug, clustered, and darker shade even if it isnt all dankity.
Covered with small almost dusty crystals. And kush always has a certain scent.

As for haze, I dont even think thats a legit thing. Kush at least has some fact behind it, weed orginating in India. High power indica. Haze is just some bullshit name given to weed like everything else, blueberry, orange, strawberry, etc... Do you really think that weeds gonna taste like blueberry? No, but something 'flavored' blueberry sounds a lot more attractive than "some good random nugs"