Hog 3 DP 8000 and Hog 4 DP 8000 difference?

What is the difference using Dp8000 (Hog 3 type the blue Ones) and DP8000 (Hog 4 the black one) connecting with Hog 4 console.Both Console and DP8000 are on the same firmware.
I've some programmer that rejects the DP8000 (hog 3 types) as a reason they are not stable with hog 4.
As my understanding DP's are expansion of universe and also can be used as artnet output/SAcn.
Can someone advise me on this? What should i explain to them?
What is the advisable nos of artnet output to be used on a Hog4 system in a session?