As I was expecting, G.Skill Trident Z Neo will be something like this:
3600 CL14-16-16/16-16-16 - highly overpriced but higher binned Samsung B
3600 CL16-19-19 - Hynix C/J, won't make much more than 3800 at reasonable timings
3600 CL18-22-22 - lower binned Samsung B (the same as in Royals tested some days ago), Micron E, Hynix C/J or any other IC that fits this specs
No samples of the Neo are on the way so far. G.Skill says there is a shortage but we will see.
I'm also testing Dominator Platinum RGB 2x8GB 3600 CL18-19-19 1.35V. My kit is based on Micron E but it's also listed on QVL as Samsung B. Tested kit works exactly the same as reviewed some days ago Vengeance Pro RGB 3600 18-22-22 but Dominators cost about $30-50 more. In short 3600 16-19-19 1.35V on X570 and up to 4600 CL18 1.5-1.6V.
Some Patriot memory reviews are also on the way.