There is only the CI 22955. The Knowles "k" symbol can be deceptive.
You will only see the number "22955" right after the Knowles symbol.
If you see line and a triangle together, that is the Knowles symbol.
If someone with a set of Westone ES3X could confirm their dual driver for sure, it would be appreciated.
If it does turn out that the drivers are the exact same, then the trick must be in the quality of the crossover.
Personally, I listen to a bunch of acoustic, alternative, classical, and opera. I prefer treble to bass and my set seems to be pretty neutral. Of course, I wish they were airier but we cant have everything.
If this is the case, I wouldn't mind buying a few balanced armatures and DIYing my own customs. I made some custom tips for my Dads FS1's using a rapid prototyping plastic. I can make molds and have access to smd parts. Crap.... more ideas.