so if you are interested the workflow is like this...
In substance I output these maps:
https://ibb.co/yWTSdnP
for my customers I create two variations:
vray_roughness
vray_glossiness
cororna (which is glossiness)
You can use the above information to understand the maps that go into these.
Now I want to create an FBX/OBJ file, but these only use standard maps right?
So I make a standard material, I copy all the images I have used for the Roughness workflow and put them into my standard material, as per the blender tutorial above. Co-incidentally this material works perfectly for export to FBX and OBJ.
I import this into blender, I dont need to do any adjustments. The material works perfectly for evee and cycles.
I import this into c4d, I need to use this base material and change it to physically based material, a little bit of manual work but atleast it imports with the textures so less work involved, still need to refine the process a bit for c4d but half the work is done in the FBX...
this is workflow.