A single unit of the lights you mentioned might not be enough for the larger tank, but should be fine for the smaller tank. It depends on what you are going to keep in the tank. If you are going to keep SPS in the larger tank, I would recommend adding T5's to the set up or getting 2 units to make sure you have good light coverage. I would also recommend getting the diffuser for the radions.
I have a reefer 170 deluxe which is about the same size as the tank you are upgrading to. I added T5's because the single hydra 26HD wasn't enough light for SPS's.