Unfortunately, those round cables won't work with Amigas as they are the newer 80 wire cables and Amigas require the older cables.
Half of those 80 wires are just ground, the remaining 40 wires are same old, so they should work just fine on Amiga too.
I know, I tried to use them and no dice.
Quite certain I used blue 80 wire cables in one of my A4000s back in the day.