Aside from the flash capability the differences between the two cameras are mostly cosmetic. Production of the f4.5 Bantam started up in 1938, but the post-war f4.5 Bantam overlapped the production of the Flash model for a year in 1947, and it had essentially the same coated four-element lens.
The front lens of the viewfinder had a crack in it. The shutter was very sluggish. I swapped the finder with that from my Flash Bantam. The shutter took quite a lot of work to get it going. I was unable to screw out the inner lens group, and ended up just squirting some electrical parts cleaner into the openings of the shutter. I was able to remove the rear lens, which let me clean the rear of the shutter blades, and that got it working at all speeds including T and B.
The images I got from my first two roll through this Bantam were lacking in contrast and had some hot spots. Not what I was expecting from one of Kodak's fine Special lenses. At first I was ready to blame my developer, but the more logical explanation was a light leak. Sure enough, holding the camera up to the sun with the back open revealed one small pinhole that was likely the source of the problem. A little black fabric paint took care of that, so I'm ready to roll again.