I have a four speed pedal set-up from a 69 Roadrunner and I've seen ads for 1970 Pedals being for that year only! Whats the diffrence? Will a 69 set-up fit in a 1970 Roadrunner?

Can someone explain the diffrence.

Im thinking about making my new project a four speed car but Im trying to use up parts laying around from other cars I've had or parted out. This is my 1st 1970 car, everything else I've ever had has been 1969. Thanks for the help!