Annular vs downleg boosters on carb

The whole “850/950” thing these days means next to nothing.
You need to be talking Venturi diameter.

The “old school” 850’s were physically bigger than the original 950’s.

With what most carb shops start out with for bodies these days, that’s not usually the case anymore.
Something like a Qft Q-950 is bigger than a Q-850....... same thing with a Race Brawler.