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The question is (since the seat frames are identical): Is the weight difference between the standard hardback 4-way seats (58ish lbs) and these manual hardback RS seats (29lbs) only due to the weight of the electric motors and wiring? That's 29lbs of electric motors and wiring per seat. It sounds like a lot to me, but maybe it's true?
The seat bottom frames are the same, being made with all the holes and nutplates in place to make up any of the offered configurations but a 4-way seat has 2 electric motors with support brackets and hardware and 4 geared motors (one at each corner) with attachment hardware, the control panel backing plate/hardware/cover/switches plus tension springs, sheathed cables, shafts, and wiring looms with all of their supporting brackets and hardware. 8-way seats add another 2 motors and gear cables/support brackets and hardware, one in the backrest and one more in the base. Lumbar adds two more motors/cables/brackets/hardware in the backrest. Heat adds 4 heating pads plus 4 additional wiring looms plus switches and relays. I guess it just all adds up: