Nuendo vs Cubase audio quality differences?

[stingray]

@albridi

Have you had this impression too, or am I getting nuts?

Nope. And yes, you are nuts. They both use the same audio engine.
FYI this subject has been covered here countless numbers of times, always with the same conclusion. There is no difference.
For example see:

Better quality bounces from Cubase 10.5 projects when opening in Nuendo 10.3?