So I've tried to come up with a way to make this clearer, as shown on these pages:
Each of the available performing versions is labelled "A", "B", "C", with a distinctive typeface to make it obvious which version is being talked about in the headings and the general information section. I'd appreciate any feedback as to whether this might be more or less confusing than repeating the terms "original version", "revised version", "3rd version", etc. on the pages.
The colour scheme of the symbols can always be tweaked if people feel strongly about this, although it's intended to blend in with the new design