Fuel Line Differences

I'm restoring my dad's 1973 240z and since I'm doing the brake lines I might as well do the fuel and clutch lines. Here's my question. What is the difference between the 1972 fuel lines and the 1973 fuel lines. Buying a set it's a $200 difference, but when looking at clutch, return, and intake that adds up quick. The car has the round top carbs from 72. Can I run the 72' lines in the car or do I need to bite the bullet and get the lines for the 73? Car was manufactured in Sept. of 72.