powersteering pump renewal

[CLIO-Si]

going to be going to take my pump of my old clio tomorow which i can easyily do by cutting the aux belt as the engine has no driveshafts so wont be getting driven anytime in the near future and wont need to be removed by loosening the tensioners or pulley from inside the wheel arch.
im concerned about the renewal of the pump onto my new/good clio,and if im taking the aux belt tension down then remove the belt and remove and replace p/s pump will i need to renew a tensioner or the belt or can i just remove belt and pump and rebuild?