Laundry Wallpaper Border Wallpaper Border Matching To Paint?

Wallpaper border matching to paint? - laundry wallpaper border

I only have my laundry room color green olive / lemon green. I have a border along the middle of the wall, and the color of the wallpaper border is exactly the same as the color of paint, flowers, olive and light sky blue, lime green leaves. My friend told me that the limit should be darker than the color of the paint. Is he right. I was surprised, one identical in color and wallpaper border to come.