So the bad news is unless u got the serial it ain't worth the effort.
The whole point of 'cracked' kontakt is that it bypasses the Service centre amongst other things & therefore no need for registration. That is unless u can extract the data from the NCS/NKX which I have heard can be done. Unless u run & side by side setup the simple answer *no* For encrypted libraries u will require a serial number to run it in in legit kontakt.