The short answer to your question is No

I'm not familiar with the editing facilities available on the KN2600 but if they are similar to the KN7000, and I believe they are, it is possible to carry out considerable 'tweaking' of all the built-in samples, including the drum kits, so you may be able to edit original sounds in the KN2600, to achieve something near to your PC samples. You can of course transfer audio sounds to the SD card and play them back through the KN2600 sound system - bit like an MP3 player - but I doubt if it is feasible to use them as part of a Style or as a 'sound'.
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Willum