OK let me set the record straight:
The Amiga 2000, 3000, 3000T, 4000T use DIN (5 pins)
The Amiga 4000 uses Mini DIN (PS/2 style)
All the ones that use the DIN are identicle and work. You can also get a cheap PC XT to PS/2 adaptor and use it on the Amiga 4000, or vise versa!