Р-60

ДВЕ БОЛЬШИЕ РАЗНИЦЫ highly coll NP, 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 Y thing X and thing Y are two very (totally) different things.

«Она (Варвара) и мои сестры - это... две большие разницы. Бойкие барышни, живые... Да и молодые, - самая старшая втрое моложе твоей Варвары» (Сологуб 1). "She (Varvara) and my sisters? Listen here...there is a great difference between them. They (my sisters) are lively young ladies, full of pep... .And they are young, why, the very oldest is three times younger than your Varvara" (1a).