This is a photo from Houzz. Everything is painted in the same white (BM OC 21, Winter White). The cabinets were painted in Semi gloss, the walls in eggshell & the ceiling in flat. I don't know if you are using different finishes on your cabinets & walls. If it's the same paint from the same can, maybe a primer on the shiplap or an extra coat of paint? Or take a piece of the painted cabinet & a piece of shiplap to the paint store & have them color match it.
I'm not a paint expert but the crown above my cabinets was not factory finished, it was raw wood. We didn't have a specific color to match to as my cabinet color wasn't a known paint brand/color. My painter primed the crown & then had the paint store match the color & the sheen.
Q
Very nice pop of color
Q