What does it look like in Unreal? Some difference is to be expected, unless you matched your lighting in Painter with the one in your preview scene in Unreal (could search for something like "substance painter unreal lighting"). In Unreal you have to ensure the textures are setup correctly: sRgb disabled for ORM map (or…
I've saved the pngs as 8 bits and that helped with Unreal, but the colors are still washed up. I get one thing on SP and another thing on UE. The shadows for the deep holes I've just painted them.