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The part number change may only be whether the coil is cloth or phenolic covered. As far as I know all pre-war coils interchange between the light4 and Zepher.
These pre-war coils had one pole piece attached to the coil and the other a separate part. There were two versions. The Early One had the coil removable from the core; on the later coils it was not removable.
A little more on the difference on the pre-war and post war coils:
The post-war coils (Zepher or lightfour) have only two "nubs" that stick out the ends. They act as the pole pieces with the newly designed flywheel. So neither the coils or flywheels are interchangeable. But one could possibly do a complete magneto swap.