Rocker moldings , Sorry E body question

Sorry for the E body question in the A body forum, seems most members on here have knowledge that covers all aspect of Mopar. Figured it made no sense to join E body forum for just the one question.
Just want to know what is the difference between the rocker molding for a 71-72 Cuda part# 3579148 and 73-74 Cuda part# 3744364, I assumed the rocker molding was the same for all four years, visually it doesn't look any different.
Please enlighten me, thank you.