Are these bucket seats the same as our year

[Hawssie]

I have a set of fairly decent shape bucket seat that came out of a 73 or 74 Chevy truck. I was thinking of using them in my 70 C10 project but I would like to recover them with the right style material. Does anyone know if the later year low backs are shaped the same to fit 70 seat covers? I know the tracks are different, I am wondering about the shaping of the foam. I don't have any original low back buckets to compare with. Thanks