Computar F9 Lenses Documents and Questions on Shutter

Good evening from 11.7.2025.
I happened to encounter the possible merchant documents of Computar f9 lenses recently, they are attached below.
They brought up several questions for me.

In the documents, 240mm, 270m and 305mm lenses claims to all come with a copal 3 shutter, if requested. But most people who owns any of these three lenses have the elements mounted in a newer copal 3s shutter, such as Mr. Sandy King.

I encountered several Computar lenses recently both online and in person, which I will also have images attached below:
A Computar 305mm f9 in a rather old copal 3 shutter which works properly;
A 240mm f9 in a copal 3s shutter with customized aperture scale, also works properly;
And a 240mm f9 in an older copal 3 shutter, but with an uncustomized scale, not sure if it works properly until it arrives next Monday.
I wonder if this specific version of the copal 3 shutter have interchangeable threads with the later 3s shutters?

Images of the known lenses attached. As you can see, the second 240mm f9 comes with a copal 3 shutter with a scale from 4.5 to 64, while the other two lenses works properly in their copal 3 and 3s.

The 305mm and one of the 240mm seems to have the same generation of early copal 3 shutter. According to previous posts around Computars, 240mm elements can screw directly into a 3s shutter, like in the second image.

Are there any other evidence that can prove the earlier copal 3 and newer 3s have the same threads and iris dias?

kzhou22 said:

Are there any other evidence that can prove the earlier copal 3 and newer 3s have the same threads and iris dias?

Click to expand...

The two are different. See "Copal shutters" in https://skgrimes.com/shutters/