I think they will interchange. I put the pedals from a 68, the fabricated ones like the Type 3 has, not the cast pedals, in a 61 chassis. They fitted OK, had to make the outer bracket to suit. The only issue was the clutch cable tube was on the right hand side of the 61. No worries I thought, I'll cut the lever arm off and move it across. Trouble is you can't get the pedal assembly in the hole with the lever on the right. On the left you can put it at an angle and feed it in, on the right you are restricted to having it relatively straight and the hook won't go through the hole. I had to do some other clearancing to get it in. Not impossible but something to check.
Cheers
Tony
Country Buggy King & Link Pin Overhauls, Type 1 & 2 King Pins, General Machining.
http://forums.aussieveedubbers.com/viewtopic.php?tid=74138
My car is KO813