Well, I'm coming to the conclusion that Canton Specifications are a bit of a cluster!
I told you the Vento Ref 9.2 DC was not the good tweeter, but I am also reading it is Aluminum ceramic oxide. I doubt the "good" tweeter is pure ceramic and the Vento Reference 9.0 DC had an Aluminum Manganese tweeter. On my 820.2, the tweeter is described simply as Ceramic, but it would not surprise me if it is actually Aluminum ceramic oxide.
In any case I just removed my tweeter and it has a paper adhesive label that reads "Art-Nr.: 17671"...and after I removed the tweeter, I saw the port is in-line and I could have just shined a light in the port and read the number from the back!
Hopefully you have the good one (or a good one)!
I'm not sure how relevant the number is. If you have the same number, I think it is safe to assume you have the same tweeter, but if yours is different, I'm not positive it would not still be the same technology.
One reason I say this is the crossover board is labeled as follows:
Crossover
Vento 820.2
Art-Nr.: 17673
Since there is only a difference of two between the tweeter and the crossover, it would not surprise me if the woofer was Art-Nr.:17672, but it is a reasonable bet that your crossover with a 7" woofer is not the same as mine with a 6" woofer (and labeled "Vento 820.2"). I guess I am saying I am not certain that this number is a unique part number assigned at the point of manufacture or if the label is stuck on when they inventory and assign parts for a manufacturing batch of a specific model of speaker!
Edit: I hope that ramble makes some sense - I know what I was saying!
...and it is not a timid tweeter, but I consider it very realistic!