[Kye]

I think the number I saw was Carrington was something like 8.9 while this is 8.4, and that's a huge difference on the scale used here.

[keepamovin]

K-Index is more like (as someone else smartly said) a kind of heuristic subjective measure like a "Cat 5 Hurricane"

Some more illuminating measurements are:

Carrington: Dst -1000 from an X80 flare and CME

May 2024 Event: Dst -250 from multiple up to X3.98 flares (and CMEs)