UAD -2 vs UADx: Unison Difference?

People are saying the UAD-2 and the new native UADx are the exact same, that they null, and there are no differences. But, my real world VO question is, does that account for UAD-2 running through the Unison slot vs UADx? So, let's do a side by side and see if Unison makes a difference. You may be surprised. Signal from the mic is split with mic splitter, then fed into two separate interface inputs.