Ummm, clearly you've never heard of the term 'depreciation', or looked into the international market.
I know the market in Pakistan is pretty insane, but there's no way a 3 year old Cultus goes for 150,000 less than the price of a brand new one (inclusive of freight, registration) - that too, after prices have increased by like 30,000 in the last couple of months.
The prices of new cars go up by 20,000, and used car sellers jack their price up by 30,000. It does'n't work that way.
Besides, even though I don't consider it a real change, you have got those disgusting new lights in the newer models, so you can't exactly call it an identical car anymore.