2k PBR Metal/Rough: BaseColor, Roughness, Metallic, Normal(DirectX), Normal(OpenGL), AO.
1k Unity Built-in: AlbedoTransparency, AO, Normal, MetallicSmoothness.
1k Unity HDRP: BaseColor, MaskMap, Normal.
1k Unreal Engine: BaseColor, OcclusionRoughnessMetallic, Normal.