quick help on ordering a wiring harness

yearone has non electronic ign. for 318/340 harness for my demon and electronic for just 340 and no 318...question is would the 340 electronic harness work on a 318 if I'm wanting to switch it over to electronic since I'm restoring the car anyway. just seems like it would be the same harness for 318 and 340 to me.
link to what I'm looking at
https://www.yearone.com/SearchResults/1966-74-A-B-E-Body/dodge demon wiring harness