clutch pedal interchangeability

I just bought the 63-66 peddles off ebay.
Had the late style, guessing 67-73.

It looks like the length of the peddles are the same 12".
The anti slip rubber covers should interchange.
The peddle differences are in the brake peddle shape.

There are a few differences in the peddle housing, mainly in how the return spring is mounted. But the overall length is close to the same 13".

The distance between the two pins on the clutch peddle measure 5 1/4" on the 63-66, while the 67-73 unit measure 5 3/4". I don't know if 1/2" is any thing to worry about.

The 63-66 unit is on the left in the pictures.