I found the link to the latest AliExpress driver.
It is basically a variation/clone of the "ETA Headphones" driver design.
I have heard these in a "four bolt" design (bigger) prototype an "ETA headphone" 1.5yr ago, and also bought them from AliExpress, but not used them yet.
They are expected to be superior to 7200 in resolution, and IMO matching 9200 level, because the prototype "ETA headphone" was noticably superior with these drivers.
They had the neutral imaging of the 7200, with a higher resolve, as opposed to the "closer", more forward imaging of a 9200. I would say very close on par in resolve, but with more soundstage depth.
Here is Link:
https://a.aliexpress.com/_mP40tme
You can see the dual concentric magnet design a little bit here:
This magnetic design was the only solution to increase magnetic field, because you cannot go higher without moving the "magnetic center" outward from the voice coil area (were the coil needs to be) , which would necessitate longer/deeper voice coil (like the focals).
The problem is always magnet quality & purity (strength rating) so the effective increase in this design is not really double, (due to quality & thinness), but it's still noticably better than any single magnet design. It (theoretically & from what I heard) can "Trump" the 9200, which (so far) had the strongest motor of the biolcelulous drivers (even all fostex and ZMF biolcelulous drivers) IMO.
The cheapest and nicest housing for the price, is not in AliExpress, but in Hifiman website. The HE-R9:
https://store.hifiman.com/index.php/he-r9.html
Only $109 is a great buy for a donor housing to try different drivers. The baffle plate is not like the Denon/fostex, so the frequency response would be affected. Usually less baffle plate holes (as this one) generally brings out more midrange in my experience, which would suit drivers that have dip in that area (like these AliExpress anyways).
So knowing this, (for example) you could take a "U-shaped" Fostex TH900, and make it more "neutral" by covering some of the baffle plate holes (!)
This is specifically because the 9200 is not having extra harmonics, like the 7200. It is cleaner sounding.
Also, The "soundstage" aspect is true, but not exactly. Image is actually larger, but noticably closer and deeper, so the perceived soundstage is different. This is due to the increased magnetic field, without Denon adjusting for the slightly skewed closer image.
The proof is they kept the same outer rear dimensions for the "rear motor" casing.
As example, different fostex drivers have different rear sized housing according to the bigger magnetic motor on the better ones.
It is an engineering aspect, that you can "skew" the image with the magnetic field (same can be done with tubes & bias points, but that's another topic).
I have done this in my own driver design experiments, even making image more distant. In Denon's case, they just slightly "magnified" it.
The result is Denon engineering dept increased performance (resolution) without adjusting for a neutral image, so it's an acquired taste, as details pop more lively.
Focal Clears are fast, clean, punchy and resolving, but all of them focals lack the low-end sonics and image size. For instance, I was listening to a track with the top Focal Utopia, and it displayed amazing bass articulation, but when switching headphones to a Hifiman HEK, my mouth dropped as I was shocked by the low end bass drop, as if the floor had dropped below me. So bass weight & image size suffers a bit with all focals (limit of 40mm piston driver).
I believe they HAD to update the 7200 driver, because too many early units (like mine) were failing. The issue is that their driver is a bit "naked" and raw in construction, with no outer rear casing. Somehow the coil starts to crackle on defective units. My guess is the layers shift as there is no outer casing of either plastic or metal on them, so not sure if that plays a role in conformity (my guess).
They are not the same regardless. The 9200 has a noticably closer sonic image, due to the increased magnetic strength, but same (flatter) exterior rear dimensions.
Hope this helps, and not too much info.