If two objects (or "types") have the relationship where one is the prototype of the other, then the other is the __ of the prototype.
In this sentence, from the context of the prototype:
This will not be true for versions that are based on this version.
I want to replace the words "versions that are based on this version" with one word. For example, in the context of one of those future versions, I could say "This was not true for prototypes."
Examples of the kind of prototypal relationship I am looking for:
Chair is to Stool
Protoplast is to Chloroplast
Examples of the kind of word relationship I am looking for:
Archetype is to Ectype
Supertype is to Subtype
Prototype is to _