Again I feel compelled to remind us of "Sarah's rule". You need a minimum of two hits of the same finish in a room to keep it from looking like a garage sale special. To follow this suggestion you need to paint your two pieces with the same finish. Two different pieces can be unified this way. Given that and the suggestions here to use a paler white than your trim and do the two pieces with the same paint, you should be fine. I agree seeing is believing and w/o more reference pictures it is tough to visualize all your possible issues.
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Stairs/hallways
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