There should be something wrong with you installation I think. I’m pretty sure that in my installation the parameter pages are named and ordered (latest vangelis). I think if anybody really knowing whats going on they might want which OS you are running.
I think even the Pianoteqs native plugin UI displays these “unmatched” parameters. Plugin parameters are fixed and global, with each having a unique ID. And they really should, because how else would hosts get automation done? So the number of parameters must be known to the host on instantiation. If plugins hide specific parameters in specific situations, they are basically only hidden UI wise. I think zynthians UI is basically a representation of hard coded, uniquely identified plugin parameters. In the case of an LV2 plugin it uses the corresponding ttl-file, were parameters can be hidden (not deleted) globally, but not dynamically.
So, in short: Pianoteq itself keeps all the parameters present, no matter which preset you chose.