As long as there's also a non-color differentiator (like a checkmark / X) I think it's fine. Just like traffic lights having different positions. The word itsel

As long as there's also a non-color differentiator (like a checkmark / X) I think it's fine. Just like traffic lights having different positions. The word itself is possibly enough, although on the other hand words take longer to process than shapes/colors so best to offer a shape if also offering a color.