PBR Metal/Rough: BaseColor, Normal(OpenGL/DirectX), Roughness, Metallic, Ambient Occlusion and Opacity.
Unity HDRP: BaseColor, MaskMap, Normal.
Unity Standard: AlbedoTransparency, MetallicSmoothness, Normal, Ambient Occlusion.
Unreal Engine: BaseColor, OcclusionRoughnessMetallic, Normal.