No apology needed - you get bonus points for researching, and answering your own question rather than waiting for somebody to rescue you! Stating the solution reinforces your own understanding and guides others who may stumble upon this topic in the future.
There is a lot of flexibility in the "Import Netlist" dialog. Not just the "Change" versus "Keep" option, but also "Import by Timestamp" versus "Import by Reference". The "Dry Run" mode is great for those of us who aren't quite sure we have our feces amalgamated as the cursor hovers over "Read Netlist". Search this Forum for more discussion about this dialog.