Unfortunately there are different thread sizes (basically two common ones for these shorter lenses if I remember right) and you need the larger one if you want to fit the Nikkor lens on the Axomat 4.
Actually I had exactly that setup when I started a long time ago. Unfortunately I don't have any lensboards that will fit an Axomat.
You can either keep looking for one (I would say that some kind soul here at apug might have one), you can make one if you are good with a lathe (the threads require some skill) or you can try to find another enlarger if you want to use the Nikkor.
Good luck.