Yes, utilize the same WDH & sway bar from the prior TV (assuming it was sized correctly), although you will have to re-adjust the WDH to conform to the new TV suspension and height.
Using the WDH, even when the loaded tongue weight falls under the TV's receiver Weight Carrying limit, will still enhance TV handling of the trailer, especially in less then ideal towing conditions. A sway bar should be utilized under all towing conditions.
2016 GM 2500HD 6.0L/4.10
2005 Jayco Eagle 278FBS
Reese HP Dual Cam
Putnam Class V