Hydraulic power unit for landing legs

Thanks for the help, the reason I asked the question I am changing my electric landing legs to hydraulic on a 2009 Sierra. The pump I have to complete the project is not the same stock # as was quoted by Lippert. I just was trying to find out if there is a difference between the pump for the slides and the legs. The pump would be a double action.
Any info would be appreciated.
Wayne