Jane, both films ask, "This is an outrage! HOW did it happen?" Although Madoff had a ponzi scheme that was a very deliberate fraud, it went on for a very long time, and the Powers That Be, who SHOULD have caught it, didn't. Both films deal with "holes" in our financial systems. There's definitely some overlap.
BTW, THE MADOFF AFFAIR is available on streaming video and is only about an hour long. Worth seeing, IMHO.