Yes, it is possible: Preferences > User Interface > Track Type Default Colors.
Yes, it works, thank you, but the case is interesting and misled me. Well, all items (Preferences > User Interface > Track Type Default Colors) in C10.5, such as MIDI, Audio, Instrument, etc., had the default HSV colors: 210, 20, 69 (like C10) BUT looked completely different than the C10. Only re-entering these values made the session look like in Cubase 10. Probably some small bug.
And one more thing - in the attachment there is a screenshot audio connection - here the colors also look overexposed (white). Can anything be done about it?