If you can line the model up again in your modeling application you may stand a chance. However be aware that it needs to line up exactly. I would never trust positioning/scaling using a mouse, I always type the values in. Other than that you can try and import the morph in OBJ format with no boxes selected and try and line it up within Poser. Pan in verrrrrry verrrrry close and get the best fit at the neck you can. Then export the OBJ and use that as your morph target.

If you can indicate how you made the morph I may be able to think of another alternative. That is you may already have the correct data but are just not manipulating it correctly.