No its not comparing apples to oranges.
Lets see a plane flies from City A to City B and WN employees work the ramp, due to their scope language.
US flies a plane to from City A to City B and the ramp is outsourced due to inferior scope language.
If US and WN both fly a 737 to the same city pairs, I am pretty sure, that duties are the same when a plane is turned, at least last time I checked it was.
Bags get unloaded, and loaded, pretty easy concept and also ancillary duties.
The thing that is different is WN doesnt outsource flying and aircraft servicing, unlike US.
And WN has been profitable for over 30 years straight, highest percentage of unionzed employees and highest paid, and WN doesnt fee you to death like US does.