Generally explodes. But there's always the other option -- load up Vicki's head in a modeller, match it up closely with Michael's head position-wise, morph it so that it fits as closely as possible if you want, and then save it as a new object, then make it into a conformer, then open up both in The Tailor and copy morphs from one to the other, then directly grab these deltas and use them because they are valid deltasfor the original head, too.