Here is the response I got from Oneway.
Your observations are correct, new keys and old chucks do not play nicely together. We originally had the teeth cut by an outside source but when we brought them in house we had to make some changes. The solution is to change the scroll in the old chuck. We do offer a scroll, part number 2998 for 26.95. The price is very low as we do feel an obligation to older chuck owners such as yourself.
I ordered one for $41.00CA so If anyone wants to change the newer type I do have a spare . .