My Vento bookshelf is the 820.2 which predates the titanium woofer, so definitely not. However the 876 does have the newer Titanium driver. It is likely not the same part number even if it is the same driver because I suspect there is a feature on the newer driver frame to accommodate the trim ring and they would change the P/N..
Here's what I can determine on the tweeters.
Vento 820.2 is P/N 17671
Vento 876 is P/N 17671
Chrono SL-526.2 is P/N 21759 (with press-in trim ring mount)
For the woofers:
Vento 820.2 is P/N 415481 (Aluminum)
Vento 876 is P/N 20130 (Titanium - mid-range and woofer are the same driver).
Chrono SL-526.2 is P/N 21768 (Titanium with press-in trim ring mount)
So, we see that the part numbers do not match up! However, given that the Chrono SL are of the current generation with the press-in trim ring I would expect a different P/N (because none of my Vento models have the press-in trim ring).
I do not have any of the newest generation of Vento (with press-in trim rings), however, anyone who has one of the current Vento
bookshelf speakers can simply look into the port with a flashlight and read the P/N off the back of the tweeter to verify that it is labeled as P/N 21759.
However. as I said, I can get a little OCD over this stuff, so I decided to talk to Mark at Accessories4Less. He is the guy who puts together the orders to have shipped from Canton (and an audio enthusiast).
I asked about the differences between the newer Chrono SL (which have the ceramic tweeters) and
Mark confirmed the drivers and crossover were the same as the equivalent Vento 8X6.2 and the only difference is the cabinets.
As I said before, the curved cabinets (the way Canton lays up plys - not like the Pioneer BS-22) is a difficult build and the expense is high. The curved cabinets reduce resonances (which can also be accomplished with adequate bracing) and break up wave reflections which the Chrono does not address.
The Ventos do look sleeker to my eye, but in my subjective experience, the sound is too close for me to detect any decisive difference and prefer one over the other!
While I had Mark on the phone, I asked him about the Vento Reference speakers and what they offer above the Vento. He said that they did use different drivers which incorporated larger magnets/stronger motor structures (and a different crossover to go with them). I like the Vento enough that I feel like the Vento Reference sends me too far down the "diminishing returns" rabbit hole, but Mark said he is hoping Canton will have a 50th Anniversary edition based on the Reference-K drivers - which is what temptation looks like ... especially if I can get it in a bookshelf version!