Sorry, I typed it out but I went up to screen shot and the window went away so redoing this from memory.
The upvotes on comments are coloured grey for not upvoted and yellow for upvoted, so that’s fine. It’s mostly on upvoted on posts; the colour doesn’t change so the only way to tell is if the number goes up or down.
I can tell from the number change but after that it’s still just grey though it does flash yellow when you first click upvote but then it goes back to grey! :)