If you take the frame and components out of the picture as they can for all practical purposes be identical in weight.
SL motor is 1.95kg
SL 320wh is about 2.5kg
The brose 2.2 is 2.9kg
The 500wh is 3.155kg
The 700wh is 3.835kg
Heaviest option at 6.735kg over an analog bike.
Lightest at 4.85kg.
That's less than 2kg maximum savings.
SL bikes are not apples to apples. They put thinner tires, smaller forks, light shocks.....all things you could but wouldn't do to a full-E.
The added Bike weight does not require special components. Most are rated for a rider well over 200lb.
1.95 + 2.5 is 4.45 not 4.85
First Look | The Specialized Levo SL Represents A New Class Of e-MTB
The Specialized Levo SL is a brand new full suspension e-MTB that joins the existing Levo & Kenevo. While it may look very similar to the existing Turbo Levo, the Levo SL is actually built around a unique motor & battery that helps to make it the lightest full suspension e-MTB that Specialized...
flowmountainbike.com
This quotes the 320wh battery pack as weighing 1.8kg
That would make the lightest option 3.75kg and the difference 3kg.
You could also take out the battery and ride with only the range extender shaving off another 800 grams.
Now were at almost 4 kilos though with pretty limited range.