I use komplete 13 standard.
Since i had install (for a check) kontakt 7 player, i have just acess to a restricted list of intruments, in demo mode (it works 15 minutes).
I cannot open kontakt 6 full version in komplete kontrol and have an access to the full list of instruments and third party instruments.. (Only Kontakt 7 player is present in the instruments list)
Note that i already have an access to kontakt 6 in Maschine but i have to navigate in the menu : "+" / "VST3" / "Native instruments" / "kontakt"
(He dont appears in the left browser)
:-/