Editor note: Parts are interchangeable between versions 2 & 3 EXCEPT:
Leg locks and snap levers. You can completely replace the leg lock assembly on version 3 with the version 2 leg locks. The snap lock levers are NOT interchangeable.
Part B1 The center column knob is different from version 2 to 3 and NOT interchangeable.
Click on the link to see the actual part picture.