I haven’t tested this in 2.80 Eevee, nor have I tested against the principled BSDF, but a couple years ago I created a material meant to perfectly match the metal-rough shader in Substance painter/designer. It uses the exact same math. The only difference is that Substance’s shader uses a different variation of the GGX BRDF model than Blender’s.
You might give it a try in Eevee and see if it gets you closer.