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