The crank should be the same. The stroke on that engine is identical to the 3.8L in the 2004 mustang. What changed was mainly the split-port heads.
Don't blame me if something goes wrong though. It theoretically *should* work but any number of things from manufacturing process to a slight change to accommodate the split-port heads could make it useless... The best I can really say is that it will most likely fit. Whether it will run, or run well, is another story.
My advice: Don't do it unless the Mustang block is going to be junked without this cost-saving measure. If it is then you've got nothing to lose.