Should a kitchen and bathroom match? Colors?

[Michael Previtera]

I'm getting my estimate together for a kitchen and bathroom remodel in a BRRRR. Should the cabinets, countertops, paint and tile all match in the kitchen and both master bathroom and secondary bathroom? I'm considering going with mostly grays since the LV flooring will have lots of gray in it and will run throughout the house.
Side note, this is my first deal so any information will be greatly appreciated. Thanks