As mentioned, Windows 95 uses more or less the same window decorations as NeXTSTEP - although with different semantics. What is minimize in NeXTSTEP is maximize in Windows 95 IIRC.

https://www.operating-system.org/betriebssystem/bsgfx/apple/...

It could be coincidence of course, but...

> my favourite example to point to is how eerily-similar the Eurofighter Typhoon, Saab Gripen, and Dassault Rafale all look - even entirely indistinguishable at an air-show in-person - despite having zero shared pedigree

Considering that France/Dassault was initially part of the Eurofighter / European Fighter Aircraft (EFA) project, I'm not sure if that's the best example to make your point.