I was thinking more if the damper was physically different, as in slightly longer or because it's from a different model etc...
I know they should be replaced in pairs, but a lot of people don't.
I once put the wrong weight fork oil in a motor bike I had many moons ago and that made the front end behave quite differently...!
After 35 years in engineering I've learned not to discount anything...
I also had a BMW that was always a little lopsided. That vexed me for a long time even after I'd changed pretty much all of the suspension!!
That car ended up with a machined spacer strategicly fitted...
I am very curious of the outcome on this one...