If you use the SD's differential, you will need to take the axles as well. The SD and SE are different widths.

Personally, I would keep the SE's differential with the better ratio. It is what I converted to and I enjoy a much quieter drive.

Exchanging the yoke on the differential isn't that major. You will need a 30 mm deep socket and an inexpensive in/lb bending bar torque wrench to measure the bearing load, before removal of the original yoke. Also, there is a locking cap.