I'm not sure, but I suspect that "one key" is likely. It's possible that the trunk lock would be different, though.
Does the ignition switch still have the code number on the face? If so, pull out the trunk handle and look for a three-digit number stamped on the shaft. Hopefully that number would match the one on the ignition switch; if not, at least you'll know what the key code is for the trunk lock!
I'm not sure what -- if anything -- you'd find for a door lock key code. I'd have to look at some of the spare "Mk1" doors I have....