Is This the Difference between Original and Repop?

[Old Newbie]

I have two sets of 30/31 rear fenders. One set came on the car, one set was purchased from a fellow. All four appear to be for the correct model ( coupe) and the correct year as per everything I can find regarding the area that bolts to the splash apron and running boards. All four will bolt to the body and to the splash aprons and running boards. In determining which ones to finish and use, I set them side by side and noticed the difference in height. See photo one. When placed loosely onto the car there is an obvious difference as can be seen in photos two and three. See how much lower the passenger side sits in photo two? Can anyone tell me what is happening here?