I'm not really surprised to see this question. It is the same with Windows 7. Some of the updates involved GDI and I could see the difference. So yes, there are multiple moving parts, video driver, OS rendering components, and the firmware. Change a driver and it's a little different, leave the driver and put in specific OS updates and it's a little different, etc. It's part of why I stopped giving a crap about Windows updates. This issue is not specific to Windows, it is every operating system. It is the same with motor vehicles. You can get "good enough" or you can orient the sparkplugs "just so".
Windows 10 is also a political football due to forced updates that can break stuff like DHCP this month, and the cloud monitoring business. Will be interesting to see how enterprises deal with things when 7's extended support ends in 2020. If they'll go to 8.1, or look for something else.