It's hard for a pusher to match a tractor simply because of one thing. The pusher prop is almost always going to have a fair amount of the air that's presented to it affected significantly by some structure or another. Put the prop directly behind the wing and the better part of the fan area right through the hub is going to be really messed up, turbulated/slowed/etc. Draw a rectangle right through the middle of the prop's available area and that's going to basically be screwed up air. And the area above that rectangle is going to have whatever it gets from above the wing. The area below will see something different from below the wing. Hang that pusher out on a nacelle on a stalk and you can reduce that disturbed air, but it'll never be like a tractor sees.