To see what the K4PC app is using as its name, launch K4PC, and look at the upper left. I always rename my PC Kindle app to something that tells me easily which PC it is. For example, my laptop Kindle app is named M****'s Kindle for PC laptop, the iPad Pro app is iPad Pro, and so on.
Rename them whatever works for you. Amazon has always had the problem of ghost devices showing up after updates etc. Making sure to edit the names to something meaningful helps you decide which ones can be removed.
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