The part of the number starting with K is a code representation of parts on the injector nozzler holder assembly but not the spray nozzle. There may be several vehicles that use the same nozzle holder assembly but have different spray nozzles or nozzle opening pressure settings. Some where stamped on the nozzles you will find a number for example 135bar. The 135bar is the opening pressure of the spray nozzle. One bar is = to 14.5 pounds per squar inch.
A nozzle opening pressure of 135bar= 1957.5 pound per square inch.
The spray nozzle will have its own number stamped on it (which is also a code representing the construction of the parts on the nozzle) but you cannot read it until you take apart the injector.
About 1 year ago I did come across a sit that gave the nozzle holder number, spray nozzle number and the vehicle it was used in. I believe that it was a Dutch site but I no longer have the informion to go back there.

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84 300D, 82 Volvo 244Gl Diesel