i am looking for several body panels for a 1974 cutlass H.O. Would the panels
from a 1973 cutlass match the 1974?. Thanks in advance.

 

The front fender will bolt on but the 74 has a marker light in the fender where as the 73 does not.

 

Also the core support, inner front fender plastics, doors are the same for supreme and salon although the door glasses are different and the 73 and 74 quarters will fit but will need some surgery at the marker lights and below the tail light housing into the body below the lower line.
Sean