Nope, ECUs are physically different too, it's one or the other.
The N/A ECU would be nice, if you want to keep using the distributor, but if you're just going to use it for a CAS, then you might as well use a turbo ECU and make use of the coil-on-plug setup.
With a turbo ECU though, you should be able to get away with out a turbo, but the precision in the tune isn't that great in the N/A range and would probably run really rich (<10:1) at full load, but it would work.