The dif that I heard is on 70 fuse block has the circuit labeled with the name of the equipment where 1971 has each circuit(fuse) numbered only. The fuse block has the 4 plug horn relay for 1971 while 1970 has the 3 prong relay. The 1971 Harness door switches are 3 prong where the 1970 are 2 prong.
Hope that helps