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So do you mean can you mix brand to brand? Or mix colors all together? I never have an issue with the stove being a different color as it is a focal point. Often, we do white, black, or blue, etc., on a stove with the rest of the appliances in stainless steel. If you mean brand-to-brand mixing, it’s ok, as long as they are not directly next to each other. Microwave and stove should match if the microwave is over the stove. No issue doing different brands. But just lookout as some may be fingerprint-free and others not, so those can go from dull to shiny finishes.