How cold does it get there in winter, does it go below freezing? If it goes below freezing much I would not move them now. If the weather when you transplant is cool and grey you may get away with not cutting back the leaves. If it is likely to be sunny and warm then cut back the leaves because otherwise the roots damaged by transplanting will not be able to provide enough water to support the original amount of leaf area. I'm assuming the leaves are still green and living? If you try moving them without cutting back living green leaves, then watch for wilting. If they wilt then cut them back. If they have plenty of soil around their roots when you move them they may hardly notice being moved.
