Roughness broken in Eevee? I can't get comparable results between Eevee and Substance. The texture maps always look way too shiny. 

I've used the Principled Shader quite a bit and know all its nuances (non-color data for the channels that need it, ect.)

Here are some screenshots of my issue. I'd love to know why I can't get this to work. Any help here would be much appreciated! Thanks.
For anyone else that comes across this, I don't think PNGs are the culprit. Instead, if you change the interpolation from Linear (default) to Closest, it should look about as close as it can to Cycles.