69- and 70 are the same. 71 has scoop and hood pin access holes on the inner frame. 72 also has these access holes but has a different attachment to the hinge so the 72 hinges are different but the hinges are same from 72-76.
So are they the same from 69 - 72 ? No they are not . Can they be made to interchange? Yes they can. Lower hing is 72-76 upper is 69-71. The early hoods the adustment is in the hood the plates slide. later are stationary and the hinges are slotted