It seems to be like you have got two six-piece burrs. There’s an excellent introduction by Stewart Coffin, and the traditional evaluation of all doable mixtures for this puzzle was accomplished by Bill Cutler.

I’d guess that the darkish six make one puzzle and the sunshine six make one other, though it is doable you would possibly have the ability to do some mixing and matching to make legitimate mixtures.

I constructed a full set of 42 items that may be mixed to make 221 mixtures. It’s a enjoyable mission.

When I have a look at the notches in your items, although, the 2 on the backside of the picture do not match any in the usual set. As JLee urged within the feedback, you may need a twelve-piece burr.