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No, they're completely different.
None will fit.
You can not. The two cars are completely different...the New Beetle has the engine at the wrong end. The New Beetle is bigger than the Old.
Some of them are, but 1973 is the year VW changed to the curved windshield in the Supers so some of them are NOT.
Chassis.
No. 1971 and 1972 Supers used different body parts than 1973 thru 1975 Supers.
The chassis is the body of the motor vehicle
The chassis is the structural elements of the vehicle. A unibody chassis, (no separate frame) includes everything but bolted on body panels. If the vehicle has a body bolted on a separate frame construction then the chassis is the frame.
Body.
A vehicle chassis is the under part of the vehicle where the body sits.
The difference is that a separate body chassis consists of the vehicle body and a separate frame which the body is bolted to (sometimes referred to as ladder frame). The integral chassis consists of a single body/frame unit, there is no separating them, they are one part (often referred to as unibody construction).
The beetle's body covering is hard. It is the beetles exoskeleton and is used to protect the beetle from predators.