Need Pro Advice On Ceiling Drywall

Hello. I recently removed a wall from between our dining room and kitchen. Unfortunately, the ceiling in the kitchen is approximately 3/8” thicker than the ceiling in the dining room. It looks like, for some reason, the previous owner attached another layer of drywall in the kitchen ... perhaps water damage or smoke/fire damage. Do I need to remove the ceiling in the kitchen and reinstall drywall to match the thickness of the dining room ceiling. Seems like a lot of additional work. Or is there a way to blend the two thicknesses? Would a blended 3/8” difference be noticeable? Thanks in advance to anyone who can provide me with some constructive advice.