CryEngine uses a “Diffuse Color/Specular Color” PBR workflow while Unreal uses “Base Color/Metalness” PBR workflow. Unity can use both and so they have documentation regarding the differences of both approaches:
CryEngine uses a “Diffuse Color/Specular Color” PBR workflow while Unreal uses “Base Color/Metalness” PBR workflow. Unity can use both and so they have documentation regarding the differences of both approaches: