zbrush has smoothing , but no proper tangent. dont expect to get good normal map if you use zbrush obj, either marmoset or pixologic hopefully will fix this issue now regarding to UV, you need to turn on merge uv in zbrush in tools, ( should be on by default )
Unfortunately this isn't something we're able to "fix" on the marmoset end. The reason i say that is because really there's nothing "broken" on our end to fix. All we do is handle mesh data as it's passed into the program, we can't really make assumptions about mesh data, because that would most likely break things for the…