No.
They should interchange, the doors are identical and the hinges are the same.
yes it can
1974 was the first year of energy absorbing Beetle bumpers. You can't use earlier bumpers on 1974s.
Yes, they were indentical
Original size is 165R15, equivalent size is 165/80R15.
Yes, since that's a tautology. Unless you mean "would additional seats fit in a vehicle without taking the original seats out first", in which case it would be a pretty tight fit, but you might be able to get them in the back. There isn't much room in the "trunk" (which in a '74 beetle is actually in the front), and I doubt you could get them in there.
correct it will fit. be sure to take lots of pictures before you pull all of the wires off. so you have a diagram of where they go after.
Not without modification. The 1973 and 1974 body styles are unique in the Nova series.
yes, the windows dont interchange tho
The 1975 regular Beetle windshield will fit the 1971 Super Beetle.
Try unlocking the car doors, its probably the alarm throwing a fit.
a 912 Porsche engine will fit in a beetle