I used to think that the only diference between 350z and G35 coupe where some exterior panels, interior touches, etc, but I tought they were the same car.

Now some guy told me they share only engines and that the chasis/platforms are diferent ones. Z33 for the 350Z and V35 for the G35

so my question is, they are or they are not basically the same car?

Thanks =)

Basically the same car. Minor chassis differences such as length, reinforcement, backseat, body design.