70 fenders

[SSeventy]

Hey guys and girls. My name is jimmy I just joined the forums so I'm full of questions so forgive me if I sound like an idiot at some point but I have a question about front fenders. Are all fenders interchangeable on 70-72 chevelles? I have a 70 that I have since high school that I am now getting into more of the resto thing. I used to drag race it every weekend and the car was always good looking Enuff for that so I never put much thought into making the body perfect. Over time I notice the gap between the passenger door and fender started closing until it ended up just about hitting. Then I noticed the fender has an outward bow to it. Is there slight differences between yrs or maybe an el camino fender that a previous owner put on? The frame too my eye and a few measurements appears to be straight but it doesn't explain the outward bow that the drivers side does not have.