I didn't look it up but a 850 is typically 1.56/1.75 So that particular 950 1.45/1.75 would be smaller. Might still be better but just pointing this out.
Yep, a 1.45" venturi with an annular booster is nowhere near a legit "950"... that's just an advertising game. It's really all about venturi size / throttle bore size / booster config. From what I've seen, a 1.50" v / 1.75" t / downleg flows pretty close to a 1.56" / 1.75" / annular, although the atomization characteristics are going to be different.
