difference between 1970-71 Dart standard dash harness???

Is there any difference between the dash wiring harness for a standard (non-ralleye) dash in a Dart between 1970 and 1971??? I know they use interchangeable instrument clusters and I can't see why it would change, but M&H only advertises a standard dash harness for 1971 and for ralleye instrument clusters only for 1970. I called them and they just don't have a "blueprint" for a standard 1970 dash so they don't know if their 1971 dash harness will work...