OUTSTANDING post, Jason and very much appreciated.
Your info and pics make the picture very clear, so mostly to recap: "Remnant" Troopers are distinctly different than any New Era stormtroopers we have otherwise seen in any of the new properties, and are acknowledged by LFL as such through licensed merchandising. Is it a DRASTIC difference from the standard, cleanwhite New Era Stormtrooper? No. But is IS clearly and consistently different. And should be accounted for in a CRL somehow, once someone builds one. I don't know how this process formally works, but we would propose a new Mandalorian "Remnant Stormtrooper" be created.
However, suits which should be noted that are NOT substantively different are the "Rogue One"-style suits from Solo and the Mandalorian thusfar, and I think it is extremely likely that we will see this same style armor as the standard depiction of OT-era stormtroopers moving forward in all LFL productions. ANH is VHS, New Era is 4K BluRay.
These suits also need to be accounted for - and I would second Jason and strongly suggest/propose doing so by renaming the Rogue One CRL something like "Non-Saga", "New Era", or "New Generation" Stormtrooper to include these other properties, as the IOC did to cover Staff Officer costumes from these properties with their Non-Saga Staff Officer CRL update. I believe the only change to the CRL (other than the name) would be adding optional accessories from the other properties (SE-14R and E-22 blasters to start, as there is clear reference).
We believe there is enough reference material to support these proposals and people willing to create the new Remnant costume and separate CRL. So what else do we need? Let's make this happen, @Sly11!
*Another note - the weathering on the Remnant is distinctly different than those for Sandtroopers - notably the black chipping seen. Also, no backpacks. MEPD can't have it