I haven't done it but I do know that the Z400 has totally different frame geometry than the LT-250. It could be done but would take a little bit of fab work to narrow the bottom frame rails to the same proportions as the Z400 frame.
That being said, Metaltech makes extended A-arms for the LT-250 that bolt right in. They can even give you the option to run the Z400 spindles if that's what you want.