Yep. The two operating systems are very, very different. The most fundamental difference: Linux is a Unix, Windows is not. Linux and OS X have considerably more in common than either does with Windows.
For an ordinary user, of course, who interacts with the GUI, how the actual OS works is less important. GUI's are designed to mesh with user experience and expectations (so they seem "intuitive", meaning icons and such behave the same way on any platform). From a user's perpective, GUI's tend to paper over the differences between operating systems.
Win10 does look to me to be shaping up as a very nice Windows release for folks who need or want to use Windows. The visual similarity with KDE has always been there thanks to KDE's obvious choice to emulate Window's GUI design to attract users. Win10 and the new KDE both show the influence of the current flat-ness fad.
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