While I'm talking about identical discs across different companies, here's a comparison chart
that I did back in 2007 in conjunction with Airwer of KSLC showing the duplicates across
KJtools, Karaoke Party Pak, Hot Stuff Party Pak and Karaoke Hits:
KPP01 = HSPAK01 = KH006
KPP02 = KJT06 = HSPAK02 = KH008
KPP03 = KJT10 = HSPAK03 = KH010
KPP04 = KJT01 = HSPAK04 = KH012
KPP05 = KJT07 = HSPAK05 = KH001
KPP06 = KJT02 = HSPAK06 = KH011
KPP07 = KJT05 = HSPAK07 = KH005
KPP08 = KJT03 = HSPAK08 = KH004
KPP09 = KJT04 = HSPAK09 = KH003
KPP10 = KJT08 = HSPAK10 = KH007
KPP11 = KJT09 = HSPAK11 = KH002
KPP12 = HSPAK12 = KH009
KPP2-01 = HSPAK2-01 = KH015
KPP2-02 = HSPAK2-02 = KH022
KPP2-03 = HSPAK2-03 = KH020
KPP2-04 = HSPAK2-04 = KH016
KPP2-05 = HSPAK2-05 = KH023
KPP2-06 = HSPAK2-06 = KH013
KPP2-07 = HSPAK2-07 = KH017
KPP2-08 = HSPAK2-08 = KH014
KPP2-09 = HSPAK2-09 = KH019
KPP2-10 = HSPAK2-10 = KH021
KPP2-11 = HSPAK2-11 = KH024