Could be both, generally, KM tools , when they are kits (a set of tools for a certain task) the base numnber is the kit, the suffix is for the particular tool in the kit.
The base number seems to be for a pinion tool of some sort, so I assume it is for repairing a differential. Given that rear axles were made by a few companies and widely supplied to various auto makers, it is possible the tool is appropriate for multiple vehicles....
PS: Axle data says the Jet and Willys (and others) used Spicer Hypoid rear axles...pinion depth , however is different, so some of the tools in the kit will be only for certain vehicles..)