Dear BHap
I think as both contact points have physically same dimensions, as quoted by you, they will do the job. It is just a matter that when installed you check that the central distributor cam lobe is able to open and close them freely.
The contact point are just a switch for high current passing. I does not matter if that part number does not match what your manual says about the contact point that should be used. Parts evolve with time, the correct part number when your service manual was written could be different of the one that superseded it along more than 60 years.
Best regards
L.Peterssen