It is quite different. I don’t speak either, but when watching Servant of the People, I could pick up a lot of words in Russian, as they were similar to Slovenian. When they started speaking Ukrainian, I couldn’t understand anything. Even the show makes a plot point of this, when they invite the wrong Korea because the words for north and south are different.
Linux has its own weird implicit copy paste on the mouse - pressing the wheel pastes the last thing you selected.
It depends though - if you’re copy pasting between programs, you’re probably using your mouse already, so it’s good that the buttons are there. But if you’re writing or editing text, you probably have your hands on the keyboard, so you need the shortcut there as well.