Lars,
Well, as I've described and demonstrated many times in my tutorials, the maps coming in through Transformer are only as good as the developer can name them. Certain developers name them just fine, others create issues with how they name them.
But let's get a few things clear here first -- in CC3/iClone you can have EITHER a normals map or a bump map. Not both -- one or the other has to be used. So there's no reason to get both of them from Daz. Most of the time you want the normals map, but if you DO want just the bump map you can easily get it by just deleting the normals map in Daz (simple to do).
Because CC3/iClone use PBR you do not need (nor can we use) a specular map. PBR is based on roughness, metallic and diffuse maps emulating the right mapping. So forget about the specular map. You sometimes have what is called a "shinniness" map in Daz instead of a roughness map, and CC3 will correctly handle that by inverting and creating a roughness map.
Otherwise, Cato comes in to CC3 just fine, with Transformer finding the correct textures. I had no other issues but if you are having some specific problems let me know and I'll see if I can track them down.
Alienware Aurora R12, Win 10, i9-119000KF, 3.5GHz CPU, 128GB RAM, RTX 3090 (24GB), Samsung 960 Pro 4TB M-2 SSD, TB+ Disk space
Mike "ex-genius" Kelley