Painting cove ceiling same color as wall, same sheen or no?

I have a cove ceiling in my living room and I want to know if painting the walls and ceiling SW Alabaster, should I match the sheen or do the typical eggshell/ flat combo? If I should get different sheens, where should I start the transition? I plan on painting the window trim/ baseboards SW pure white (7005) if that helps. Thanks submitted by /u/ScottSteve101 [link] [comments]