I'm not sure where you're getting that but the exact same game version is listed for both setups.
In terms of differences I've seen this before from multiple sites benching now since the ATOS benchmark came out, Nvidia puts in bolder colours but AMD appears to have more snow. Fud manages to say AMD has more snow but then calls it out as having less chasm detail, if Fud had ever been anywhere near snow, snow washes out detail in the same way. Koduri telling them to ask the game maker directly which is a more accurate representation of what they wanted.
The issue of it looking different on AMD and Nvidia has come up on OCUK before in similar videos/image comparisons. To me it looks like Nvidia has less detail but then has bolder colours and highlights a few things like sticking out bits of rock which gives it the appearance of more detail. It's really up to the devs, if the idea is more snow but Nvidia is tweaking a setting which reduces snow and improves performance or it could be the other way around, AMD is tweaking a setting and adding snow which increases performance. Either way, every single comparison I see the AMD and Nvidia demos I see always look different.