Oh, but it does! Go to the "Specifications" page, or the "Lenses" page (which combines serial/specs/accessories) and you will see the optical construction in elements/groups. Maybe I should also add it to the serial number page??
Of course the number alone is not sufficient to distinguish the two Nikkor-Q 135/3.5 lenses, both are 4/3. But if you read the text at the top of each page you will see: "Versions with the same optical design are grouped together." Perhaps I should add that thick grey lines separate lenses with different optical design, so you can very quickly see which models have the same optics (thinner grey line indicates the optics are basically the same, but have been "tweaked" to improve performance)
Nice little set you have there, you can easily see how the AI is smaller, in spite of having a built-in hood and focusing closer. You can also see the distance between infinity and the 20m mark is a little closer on the AI version, which shows the focus throw is shorter, but not my much.
I really should use my 135/3.5 lenses more often, I generally grab my 75-150/3.5 which is a much more flexible lens...