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Lighting shifting per model

I’m new to unreal and I’m having issues with keeping consistent lighting across the walls, my work needs layers of the walls to be turned on or off (like the Sims) so they are stacked on top of each other. They are all the same material but the lighting shifts between every piece of geometry.

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That’s due to this: https://wiki.unrealengine.com/LightingTroubleshootingGuide#Shadow_Seams.2FShading_Differences_with_Indirect_Lighting

You won’t be able to avoid lighting differences with objects like that. If possible, you will get much better results and performance by making unique objects for large sections rather than building them out of multiple objects.