What are the plymouth dash wiring harness differences from 74 to 75

I pulled the FSMs from mymopar. Will print them out tomorrow and compare the 2. I agree best way is with wiring side by side to compare. He doesnt want to pull the 75 valiant harness unless it will work in his 74 duster. He isnt a wiring guru, which is why i was asking, and mentioned modding the good condition 75 harness to suit.