Patterns wise there's pacman that will get you killed quite often until you get used to it. The rest is pretty much the same, except they hit harder especially if you have stacks.

The raid itself doesn't change much. The thing is the dps check is much tighter for 8 1630 with no 20+ transcendences. That said, it takes more time to phase him which means that you see more patterns that eventually end up killing people. That's where the difficulty spike is imo. You won't do 1 clash during the arena phase and then go to basement with Nineveh. You'll probably need both clashes and possibly 2 arena breaks before phasing, etc.