Is the frame bracket that holds the brake pedal in an automatic the same for 4 speed cars?

I have a 4 speed clutch and brake set-up out of a 4 speed car complete with mouning bracket. It looks like I can just take the brake pedal out and install the smaller brake pedal and the clutch (with that small side braket) without removing that frame/mounting assembly. Is this correct?

The car is a 70 Challenger. The clutch and brake assy is out of a 73 Cuda.

It looks like everything lines up

Thanks