IMP-3MP98C-H vs YC-HD785R-20X

Probably the same thing...Model numbers and listed specs mean nothing to these Chinese sellers...Pretty much, you dish out the money and they'll send you whatever they want to send. Most seem satisfied with what they received based on the ratings, so unless there's some special purpose in which exact specs are important, it would probably work for you.
 
SAme question I made two weeks ago via chat. Just before I bought to the seller. He didn't know the answer. Only he said "You want this one" (YC-HD785R-20X) and I did.

Both are the same. One Imporx's reference and the other from Yunch.