Yes, it follows that if you're using the same texture on parts that are different sizes the texture will not be scaled the same. One approach that comes to mind immediately is to assemble your figure in Poser, export the whole thing to a .obj file then UV map it. That way all the parts will have the same mapping scale. Create your textures based on the template you'd get from 'Mapper. You could then import it it and set it up as a figure in the setup room if you're using the ProPack or build the .phi file and run the assembled figure through the heir converter.