I think they are different. Pushing a blower, whether forwards or backwards, the cutting enters the material (snow in this case) level because the tractor wheels are level on the cleared roadway. And the cutting edge stays level as long as you fully cut down the material leaving a level roadway behind you for the wheels. It's just like running a dozer. You need to cut the material ahead of you to leave a level surface for the machine.
When pulling a blower the tractor will already be out of level before the blower starts to cut, so it will cut out of level. The only way to get a level cut is with a tilt. So in this respect I think push has an advantage over pull.