It’s not easy to see a difference but there is. The first is the “real” dress from DKNY and in the second pic there is the copy from H&M.
DKNY, $525 H&M, $33
It’s a BIG pricedifference but I prefer the dress from DKNY because it’s the real thing and it has better colors.
(and find your DKNY copy fast!)