Ok, support got back to me.
It appears the Cumulative Preview from November 19th has the exact same file hash values as the catalog, at least for the two patches I require.
Ideally it would be nice if HCL would republish the fixlet, just so it’s up to date from a wording perspective and aligns with Microsoft. Moreso, it would be nice if Microsoft instead of saying "Parts of this update were previously released in the Cumulative Update that’s dated November 19, 2020." would instead say the patch is exactly the same.