Kuldeep,
If you are at a university beginning with B and ending with L, and the aeroplane is located near the base of tower C, try contacting a chap called Michael Bromfield within your school - he has done a lot of research into the C150/152 family and should be able to give you something with absolute chapter and verse on the changes between all the models.
(And if you chaps actually finish building the thing this year, it'll be me coming along to flight test the SKR next summer).
G