Nothing is different CHASIS, Underbody wise...
Remember, Mehran was ALTO of 1986, and it got its first shape change in Japan in 1990 with everything else same, just outer and inner shape change and even smaller engine of 600cc, that one failed miserably, and probably again in 1994, adn 1998, got shape changed as most Jap. cars get updated in 4 Years.. So, your ALTO is same as ALTO of 1986, with just minor exterior changes..... only update twice.........
So, don't think that you are in a Mercedez while driving an updated form of 1986 ALTO GA of Japan...