Side Note:

Sometimes the issue with importing 3rd party Fbx is quiet simple, like in your case it might already fix the issue in poser by just 0 the figure. Sometimes Fbx loads with changed scaling un individual parts also rotations might be loading wrong. Check the individual parts it they have changed scaling and rotations, make sure to load the fbx original size in poser not scaling it up or down while loading. if it is just that the position and scaling changed while loading then it is quiet simple to get it fixed right in poser.