the one rule that I use is to not mix figures from different sources, ie If I want a female character in a scene with James I will look to Jessi or Miki (don't have p7 so Syd is not an option) If it's M3 that I'm matching up then it's V3, or SP.  I've found that mixing Daz meshes with CP meshes throws the whole look of the scene off, kind of like using a CG character in a scene with a cell shaded one and trying to make them blend. It's possible with enough work, the right materials/lighting/etc, but unless there is something that is requiring to use those 2 specific characters it's best to change one.