Some of the skins are of thicker material, also you will find gussets internally such as where some of the ribs join the spars etc and in the fin etc.......... the 150 also had roof windows, but not sure if the 152 has them, I think you also have a full harness again like the 150............ Engine wise I cant remember if they are different, the 150 Aerobat has a RR Continental 0 200 but it is a while since i touched a 152 Aerobat........
Will have a look tomorrow through my maintenance manuals if I get time