Are 2 and 4 door 1966 Chevelle frames the same?

The frames of the 1966 Chevelle are generally the same for both 2-door and 4-door models, sharing the same basic design and dimensions. However, there may be minor differences in certain mounting points or reinforcements due to the variations in body style and weight distribution. For most restoration or modification purposes, the frames are interchangeable, but it's always best to verify specific part compatibility.