Difference between Asus Tuf fx504 and fx505?

[Wallonthefloor]

Hard to find specification details, I am getting a high end max spec fx504 and want the metal backplate is that only on the fx505?

 

[helpstar]

couldn´t find it either for the FX504. Eventually get directly in contact with ASUS

 

[benharrison]

I can't find the details. Maybe the difference is in the color of the case. I think they have the same specification.