Yes, the entire factory styles, performances and pads will be overwritten with........
..........the same factory datas...plus the new ones !
So you loose nothing, just benefits !
For the SOUNDS:
There are no free slots in the factory sounds banks so only user1, user2 and userDK banks are used for the new sounds of the Dopamine Set.
I recommend you have a look to the PDF in the ZIP file. The last column indicates "Korg Factory" for all resources already present in the Factory resources 1.1 (PA600)
Hope it's clearer.
Korg PA600, Yamaha MOXF8, Korg nanoKontrol2
Free set with 1200 styles for PA300 to PA4X with Korg resources and a bit more: Look for
Dopamine set 2.6 and PaStitch