In theory if you are using the same books on both the K2 and the PW2 you could put them all into collections on the K2, then syncronise the K2 with amazon (connect it to the wireless and let it update the settings on the server), then sideload/download the books onto the PW2.
N.B. you have to have the books on the device BEFORE doing the final stage!!
Final stage is:
From the home screen, click Cloud - Menu button - Import Collections
Then select the K2.
I have personally done this to copy the collections from my Touch to my PW and then from my PW to my PW2 and it worked with both downloaded and sideloaded books.
I am sorry if this doesn't work on the K2 but am unable to test as I don't have one, I have however successfully done this with the above devices.
