UE5 Metahuman SRMF Textures- SP Export Template

Hi, I am new to SP and trying to customize some Unreal Engine Metahumans.

According to Epic guides the the needed SRMF texture is relatively Specular,Roughness,Metalic and Fuzz.

I created an export template in SP in order to export spec and roughness but not quite getting the result.

Metalic and fuzz is not important for me since character is non metallic and fuzz is another thing.

Attached you can see samples from Unreal's original textures and the ones I got from Sp with the export template. Could you please help me with the export template which seems I am doing something wrong.