The first is a half-hour radio version from 1938; the second is a half-hour radio-play adaptation from 1945; the third is a further and one-and-a-half-hour adaptation for radio, but this time of the screenplay Welles wrote in 1939, which was to be his first film. It wasn’t—famously—but it was finally produced, if in a necessarily much-adapted form, in 2015 by the BBC.
They are all quite good; more details here.
