Nope and nope.
Like I said these are to be welded in. There is a chamfer where the diameter changes, its just hard to see. The bottom of the knuckle and the top of the step will be tight with no gap therefore there is not room for the radius. The design is also different since these are to be welded in. Most of the stress will be transfered in the outer portion of the spacer, not the inner diameter and transition where the clamp in style spacers are prone to fail.
Also the will not be heat treated since they will be welded.
As long as there is a clean non porous weld the knuckle should fail before the spacer.