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K4PC is the device. When you register it, you attach it to your account as a 'Device' (It can only be attached to a single account), and your Amazon Content is now available
The purchases belong to your Account not the device. If you deregister a device, you simply cannot read any existing book with DRM on the device.
For some reason, My TAB A always shows as 2 devices (both registered the same day). But that is the only thing I noticed about registering devices (I had deleted one and the viewer would not show existing content until I registered it again)
If you Go to Manage Mydevices and content, expanding a device will tell you when registered and also will show the content the last time connected (sync).
That may give you a clue, but I think all you lose deleting is the Reading Status (location) for books on that device..
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