Yep. I think you'll be fine, just save the water, mainly so you don't have to make a bunch of new water and to try to keep things as close to the same as possible. Install the new sump, add the same water, equipment, etc. If you had live rock or bio media i'd suggest you keep it wet so you don't lose as much bacteria. You'll lose some from the sump itself, but you could always add a bottle of bacteria, like bio spira, to cover your losses if you're really worried about it. Ultimately, you should be fine.