I think the floss number is correct in correspondence with color description.
But I can say with sureness that it might not be the perfect match for the color regardless, and this is why.
The colors that you see on a computer are different than those you see in life. Computers use red, yellow, and green, while your eye sees red, yellow, and blue. The programs use approximations based on color blends to get the floss number it gives to you. For example, in my Super Metroid project, PC Stitch gives me a darker brown than DMC Stitch Creator.
It also depends on personal color threshold, but if a color doesn't look right to you, such as in this case where you think the color is too bright, go ahead and replace it with a darker color. It would still look great