What is the difference between teacup pigs, vietnamese pigs, mini/micro mini pigs... etc?

Question

which is the smallest?

are they the same??

Answer 1

 you are all stupid and wrong they both exsist but i am trying to figure out which one is smaller too

Answer 2

 I know that micro mini pigs and teacup pigs are both real. I am just wondering which one is smaller. I am thinking to get one as a pet but I would like the smaller of the two. Please answer this a.s.a.p. 

 

Thankyou :)