A funny question, will I lose Komplete 13CE instruments if I decide to upgrade to Komplete 14 standard? Or will I get to keep the 13CE instruments in addition to K14 standard ones?
What you want is a downgrade and that's afaik not possible. IF it was possible, you'd possibly lose some products. You can only upgrade to a highter version - e.g. Komplete 14 Standard -> Komplete 14 Ultimate.
People seem to confuse update and upgrade often. The difference:
To clarify, Komplete 13CE instruments = the ones that are not in the 14 Standard version