Which color to choose for room doors?

And what if the window frames are RAL7016? Then also anthracite-colored doors?

Good point. I have no answer to that.

I would leave the kitchen as it is. It is an independent entity that only has to harmonize with the rest to a limited extent. I would also choose white doors, regardless of the color of the kitchen. In my opinion, doors should be inconspicuous anyway, except for specially crafted or elaborate ones.