Pruning newly transplanted plants is almost never a good idea. Pruning a plant initiates a response (including an attempt to replace the foliage lost) by the plant that takes energy away from the plant's ability to recover from its root loss. It will almost always adds to the stress experienced by the plant and increase the time required for the plant to become established rather than decreasing stress or improving the odds that the plant will survive. The need to match the top-growth/foliage to the root mass when transplanting is an old theory long ago proven to be wrong. Even some nurseries resist changing what they were taught years ago, but all modern research strongly indicates a need not to prune healthy wood/foliage at transplant.