No difference, HyperX Cloud comes in 2 colour options, White with a bit of black, and Black, with a bit of red.
And normally if you see the word "pro" there, I assume there's a "gaming" follows behind.
It's actually named as HyperX Cloud: Pro gaming headset, a headset made for pro gaming. Not HyperX Cloud Pro, Headset made for gaming.
So there are no advantages whatsoever, just go with the cheaper one.