My suggestion with this would mirror what Norm has said.
It looks like they are similar in basic configuration, however that could be deceptive. Just double check that the shaft diameter is identical and that this is maintained if there is any taper. I would use a micrometer but decent calipers or even dividers will do the same job; provided accuracy is consistently maintained.
If theyβre not the same diameter in the working/fitting part of the shaft no amount of judicious and careful dremmel work is going to help. They need to be identical or the resulting misalignment will result in catastrophic failure.
