[willy]

Deshet you are comparing two really nice boats, one bigger than the other, you have to weigh what you want in a boat, size, whether you will be trailering or docking in a marina. I rode in a v20 CC and it was a sweet boat but a few extra feet ain't nothing to sneeze at, usually makes a substantial difference in ride and dryness. As far as engines I don't believe you can use the sea drive on anything but a sea drive mount if that is what your asking. The point both I and MJ made was to use that sea drive until it is finished and then take it off and put a bracket on it and new/rebuilt outboard of your choice. What you will have then is improved performance and economy, and because it is a sea drive the transom should be very dry strong and most importantly FULL.
So it all comes down to what you want/need both look to be excellent boats. ;) Tough to beat a V20 in any configuration near as I can tell, but that 23' CC with a bracket and newer power would be as fine a boat as you are likely to ever fish from.