Р60
ДВЕ БОЛЬШИЕ РАЗНИЦЫ
highly collNP,
pl only
subj-compl with быть0 (
subj: any two common nouns, infinitives, or clauses),
usu. pres
fixed WO two people (things, or phenomena, or two groups of people, things, or phenomena) are totally different, defy comparison
X и Y - две большие разницы - there is a big (great) difference between X and Y
there is a world of difference between X and Ything X and thing Y are two very (totally) different things.