Yes, that's the likely cause. On the head map, the neck is nearly the full width of the texturemap, while it's tiny on the body map. I did a quick check on some DAZ textures, and the head was about 720 pixels while the body was 150. What you need to do is start with templates, either direct from a ultility such as UVmapper or using one of Snowsultan's seam guides. Use them as layers in Photoshop, Paintshop Pro, the Gimp, or whatever you chose to use. And one thing you can do is take the neck area of the body texture, and transfer it to the head texture, re-scaling and positioning it as a layer that matches the neck-edge on the head. You'll still have a problem with differing resolutions, but if you're using Poser 5 and later there's even a fix for that. You can make a large, high-res texture for the neck and upper-chest area of the figure, and use the scale and offset settings on the image-map node to position that in the UV-space for the body. You could also make something a little like a transparency map. You'd then use a Blender node to mix the normal full-body map with the neck-area hi-res map, controlled by that transparency map. Now, I'm guessing a little here, but UV-space seems to have 16-bit resolution, while there's a 12-bit limit to the dimensions of a bitmap loaded into Poser. so a 4000-pixel body-map has about 400 pizels for the neck-width, while a 4000-pixel head-map runs about 3800. To be honest, a 4000-pixel head seems a bit large for most jobs. A 2000-pixel head combined with a 4000-pixel upper-body patch could look pretty good. Now, I haven't tried this specific trick, though I've used the scale/offset method for a lot of stuff, such as lips and logos on tshirts. Poser 6 lets you use an alphachannel, rather than a sperate control texturemap (and I'm not sure if P5 does that or not). And I'm not good with hair or fur. But the process should work. So let me know how it comes out.