When trying to match different mocap animations you need the body to be in the exact same spot. There is a need of an alignment-tool to do so;
Right now the best way is to use the reach-targets, and use them between scenes; but it's an issue when the pelvis is supposed to move. You should be able to use the reach target as a starting position, and play the rest of the animation as is. Or just get a proper alignment tool.