In the first world list I ever downloaded from the web (must have been Sibley & Monroe, late 90s) they were already Chestnut- and Buff-throated Partridge (but not: Monal Partridge). To me they are most easily remembered as Ticked and Dipped Monal-Partridge.
"Chestnut-throated Partridge" and "Buff-throated Partridge" were apparently inventions of Sibley & Monroe in the 1990's. Or, at least, I have not been able to trace any use of these names in the older literature for a
Tetraophasis sp. (As I have already written above, "Chestnut-throated Partridge" can be found in quite a few older works, but it refers consistently to something entirely different there.)
Sibley & Monroe's names were subsequently adopted in the original BirdLife checklist (2007); from there, they were continued in the printed HBW/BLI illustrated checklist (2014; in the HBW book series, the traditional Verreaux's and Szechenyi's MP had been used), and then in subsequent online updates of the HBW/BLI checklist until now.
Clements used the traditional names up to their last update, at which point they opted for Chestnut- and Buff-throated Monal
-Partridge instead, i.e, names making use of S&M's non-eponymous epithets, but with "Monal" added to "Partridge".
H&M, last, have always used the standard Verreaux's and Szechenyi's MP, and continued these in their
Aug 2023 update of Phasianidae.
IOW, the recent move by IOC is arguably a switch from names that were in prevailing use among world checklists (IOC + H&M were using them, while the other two checklists each used their own, distinct flavour of non-eponymous names), to the non-eponymous variants adopted a year earlier by Clements, which have basically no history of usage...