You cannot cross conform clothing item between models, they are rigged differently and the clothing item literally will conform to that model only.  You either import the tie object into Poser and rerig it for James, or import the tie object, reposition and use it as a prop.  Saving it as a smart prop will should do the trick, however you will lose any morphing capability for that item.  Converting the object to a CR2 figure should also work, but again you will not have the original morphs.  Another alternative, would be load the tie figure, position it, and parent it to James.  You will retain the morphs this way.