The exact version of Android you’re using isn’t the only important information. If you want to get help for a specific device, its manufacturer is also important — for example, Samsung’s version of Android include the TouchWiz interface, many Samsung apps, and extensive interface modifications performed by Samsung.
Microsoft doesn’t allow PC manufacturers to change the way the Windows Start menu, taskbar, and Control Panel works, but Google lets Android device manufacturers run wild and change almost anything they want. Different devices from the same manufacturer will also have different customizations, so knowing the exact device you’re using — as well as its manufacturer is crucial when trying to get information or even custom ROMs for a specific device online.