Should Kitchen Knobs Match Appliances Should All The Cabinetry Hardware In My House Be The Same Throughout?

Should all the cabinetry hardware in my house be the same throughout? - should kitchen knobs match appliances

I need room cabinet hardware (Sweater / buttons) in two fully equipped bathrooms and my kitchen cabinets. All fittings are chrome plated, but I can not chrome. My kitchen appliances are some steel with maple syrup and my cabinets are black. My granite shades of black, gray and beige. I thought the drawing, the black iron kitchen and Nobs. For the kids bathroom / guest toilet) (I thought Knickel or brushed brass coincide () with the mirrors. In my master bathroom, I thought Knickel brushes (to coincide with my mirror). Does not seem so beautiful? Thanks