The blower will turn, but not fast enough.
I took a chance and bought a used high flow blower to use on my standard flow 763. The first good snowfall I tried it out and found it would turn but not fast enough to throw the snow more than about 3 feet.
The flow rate in your auxiliary circuit determines how fast a hydraulic motor will turn. For a given flow rate, the larger the motor displacement the slower it will turn. High flow blowers have larger displacement motors to allow the blower to turn at the correct RPM.
Normally when you order a blower, they will want to know what the auxiliary flow is on your loader so they can specify a blower with the correct size motor.
I contacted the manufacturer of my blower and they gave me the specs on the hydraulic motor that I had and what size motor I needed based on the flow in my auxiliary circuit. After much searching I found the correct size motor for $525.00.